Why did the British not like the American planes

[V-1710]

Certainly the RAF and other Commonwealth air forces used the P-40 with great success in North Africa. They were not happy with either the P-39 or the non-turbocharged L-322 Lightning, but you can't blame them, both of those aircraft had serious shortcomings. There was also those Brewster Buffalo's that the RAF was flying in China alongside the Flying Tigers. Not very successful, to say the least.