[HarryT]

Sounds like a simple matter of sort order. To sort by series order within author, click first on the "Series" column header, and then on the "Author" column header. If you want to make this the default sort order when Calibre starts, go to "Preferences / Tweaks", and set the value of the "Specify columns by which to sort the booklist on startup" setting to:

sort_columns_at_startup = [('authors', 0), ('series', 0)]

(The default sort order when you install Calibre is to sort by title within author, which will scramble your series.)