Would something yellowish with ridges and a spike at the top be a chrysalis or a piece of bark in South African grapes sold in the United Kingdom?

Answer 1

Yes, it's possible that bark or chrysalis may be found inside grapes [Vitis spp]. Such a thing can happen if a strong wind sends a piece of bark or a chrysalis right into the forming, fruiting bud. It also can happen if a nesting or foraging bird accidentally drops a mouthful of nesting material or food right into the forming, fruiting bud. Yet another possibility is a grape berry moth [Endopiza viteana (Clemen), Eupoecilia ambiguella, Lobelia botrana] larvae that dies inside the berry.