Hi,
I managed to buy some A&P from the independent pharmacies, but I think that the company who manufactures them seem to have stopped supplying to them too as they tell me that they haven't had any in for some months now.
However, an alternative, which was recommended to me by my health visitor, was Anbesol liquid, I bought some from Boots, but you have to ask behind the counter for the one which is suitable for babies. It seems to do wonders too as my little one really does stop crying after applying it straight to her gum. Unlike the teething gels, this liquid form goes onto the gums and stays there!
Hope this helps.