[DoctorOhh]

Originally Posted by JayLaFunk

I have this ticked Preferences>Conversion>Common Options>Structure Detection>Insert Metadata as page at start of book - As I want the book summary in the metadata...

Have tried reconverting the books that are still showing tags but can't get rid of them...

You can find the style.css file that controls what is inserted in the Book Jacket here.

C:\Program Files\Calibre2\resources\jacket\style.css

Find this area in the file.

table.cbj_header tr.cbj_tags {
    /* Uncomment the next line to remove 'Tags' from banner section */
    /* display:none; */
    }

and change it to 

table.cbj_header tr.cbj_tags {
    /* Uncomment the next line to remove 'Tags' from banner section */
    display:none;
    }

After this change tags will not be part of the book jacket in any future conversion.