Thanks very much chaps, I really do appreciate it.
Andy, I thought the port lamp cover had moved too, but on checking, it's actually flush! I had a close look at it through the magnifying glass, and it is even all round. However, if I hold the model and turn it, at certain angles the refracted light, through the cover, shows the Interior Green edges of the lamp housing in a distorted fashion, and makes the whole thing look misaligned - very strange!!
I will admit though, these were the only parts in the kit which were less than a perfect fit (apart from the engine bulkhead to fuselage joint, which was a bit vague), and I had to file the inside edges of each lamp housing, before making and fitting the lamps themselves, and then the transparent covers.
Have a look at the first pic in the series - the cover looks fine at that angle !