I had a chat with a pharmacist about this at the weekend. She says the rules changed because there was no evidence they reduce the length or severity of a cold, but they do relieve the symptoms. So, the advice is that they are no use for children - but I think that relieving the symptoms is surely important!
Anyway, she also said the problem with medised is that pharmacists felt most people were buying it for its sedative properties rather than snot-drying ability and there were concerns it would be a problem if people were using it at the same time as Calpol (since they both contain paracetamol).
The GP also said something similar, but said to use common sense and trust my judgement as a mum.
Donna