This seems to be a recent development. Even buying paracetamol or suchlike seems to involve a major interrogation now. I try to lie as much as possible in these situations. Allergies? "Nuts, yoghurt, raspberries, football - that's all". Medical conditions? "Impetigo, hernia, herpes, warts, nits, fungal infestations, schizophrenia." They soon try to get rid of you. Try it.