It could be codling moth. The grubs are laid in the developing fruits and then decimate them. The way I deal with it is to spray (there are organic sprays available) at the beginning of winter (if I remember) and again just as the blossom is about to open. It is gutting to see the fruits gradually ruined. Bad luck.

Could also be the cold......

Try grease banding in early autumn. I did this last 2 years and no probs after that. Messy/tacky handling the stuff but worth it. Should be able to find at your GC.

Very sorry this has happened - you must be gutted.