After fixing that line in the opf and re-checking with epubcheck, I now get the following (but the book now open in Calibre's viewer and seems ok):
Code:
Validating against EPUB version 2.0
(http://code.google.com/p/epubcheck/)
June 3, 2013 9:03:11 PM BST
---------------------------------------------------
ERROR: <book name>/OEBPS/content.opf(228,9): element "tours" incomplete; missing required element "tour"
ERROR: <book name>/OEBPS/Text/part0000.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0001.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0002.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0003.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0004.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0005.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0006.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0007.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0008.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0009.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0010.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0011.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0012.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0013.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0014.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0015.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0016.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0017.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0018.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0019.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0020.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0021.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0022.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0023.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0024.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0025.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0026.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0027.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0028.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0029.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0030.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0031.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0032.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0033.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0034.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0035.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0036.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0037.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0038.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0039.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0040.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0041.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0042.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0043.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0044.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0045.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0046.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0047.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0048.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0049.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0050.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0051.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0052.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0053.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0054.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0055.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0056.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0057.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0058.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0059.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0060.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0061.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0062.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0063.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0064.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
ERROR: <book name>/OEBPS/Text/part0065.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
WARNING: <book name>/OEBPS/Text/part0065.xhtml(14,86): use of non-registered URI scheme type in href: kindle:embed:0014?mime=image/jpg
ERROR: <book name>/OEBPS/Text/part0066.xhtml(1,149): attribute "style" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
Check finished with warnings or errors!