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[karnevil]

Thanks everyone, some useful answers.

@kh99 - Yes you are right, the blogs are very underused, most activity is posted on the forum. Never even occurred to me an empty set may have been causing the error.

@Lynne - When the blogs were more active the permissions were set that way and have remained the same ever since. As there is very little activity on blogs now I have changed the settings to allow guests.

@tbworld - very useful, thank you, now bookmarked.

Next question if I may, as the blogs are rarely used and all activity takes place on threads/posts, how would I exclude blogs from the sitemap?