OK [drum roll] it's 'spot the Beta 1.19 improvement' time.
First up, who can identify what's been improved with the Spitfire I?
I hate to be critical but I've noticed a few more things which aren't correct. The Spit has the later Mk. IX elevators which were introduced on the production line in 1943 (the double-angled mass balance weight, Mk. I-V all had the earlier 45 degree balance weight:
The decals on the upper wings are also too small, and the wrong colours. But otherwise, the model is perfect.