Unknown species, new sighting 2023 in UK garden.

This little caterpillar is about 2cm long. It developed inside a healthy plum fruit and then emerged almost colourless, before turning slightly pink, once the plum started to discolour / start going over.

If anyone can ID this species it would be very helpful, thanks in advance.

#caterpillar #newsighting #unknownspecies #IDrequired