Yep Just to change the Engine number when I put in the GTA engine - OK I also changed the Capacity. My last car when i changed from twin cam to v6 I just sent in the V5 and no problem. This time did the same & got the V5 back unchanged then 2 days later a letter saying that to change the engine I needed to provide proof in the form of a receipt from the garage that did the job, on headed paper, or a report from the RAC or AA (they charge £200, I asked).....

Decided to try with a report from my local garage, on headed paper saying that they had looked at the car & it was fitted with engine no######, Type ##### , with Capacity ######. It cost me a donation to the tea & biscuit fund.... And was accepted by the DVLA. Even the garage guy couldnt understand why they wanted a letter!

Changed the colour last time I was home and that was no problem....