Thanks to you both...
Hilmar - I found your document enlightening!!! I will have to go back over some of my previous projects - I have had an "If in doubt - index it!!!" approach up until reading your document...

Thanks also Daniel - you've been with me all day on this!!! Cheers for keeping posting back... I think your right it is a bug - but after reading Hilmar's document I will remove the indexes...

Glad we got to the bottom of it!