Well I have just changed the code form RC to ECS (20%) for relevant purchases this VAT quarter and in my report, all boxes are the same except box 6 where it has included the amounts (it didn't under RC).  I will use this in future as the whole reason for me to check if there had been a change is that the last two VAT returns I have filed flagged the warning: Based on the current rate of VAT, the amount you have entered in Box 1 exceeds the amount HM Revenue & Customs would have expected you to declare in comparison to the value you have entered in Box 6.  Although I was paying the correct VAT, QB was obviously not showing the correct amount in box 6 using RC.  Thanks for your help - you have been much more helpful than QB support!