Hmmm, haven't had too much leaf damage, with exception of some of the bhuts with holes in the leaves. I initially blamed this on the previous greenfly infestation, though could be mistaken!
I will have a hunt for caterpillars etc tomorrow, and cut open the pepper in the picture... The Serrano was never a particularly good plant - so I was surprised when it fruited first.
Suppose it's possible that a bird flew into the greenhouse... it would have been clever to find the one and only pepper, but I guess that's how they survive :-) But then I wonder if it would have taken the whole thing?
Hopefully I can fix the problem, before I'm lucky enough to get more fruit.