Thanks all, had to happen at the weekend when everywhere is closed ... our local GP and District Nurse offices are both on emergency call service only today and not really sure this is urgent enough to bother them.
I will look at Boots but when I checked all the chemist options online last night, suggested you need a prescription and they are only available in boxes of 10. He will only need one until is TWOC appointment on Wednesday morning, so might be able to manage, but I am concerned about infection with using the same bag for so long. His recovery has gone so well don't want anything to send him backwards! The bag has a tiny split where the top pipe goes in, it was fine all day yesterday, but when he sat down in the evening and allowed the bag to fill more than he does during the day, it started to leak. They gave him loads of night bags, but only the 2 leg ones, which seems a bit illogical ...