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Thanks Scarlett and Petal.
I didn't assume they didn't need a seat Joko, not in the disabled bit anyway (unlikely though that not one person on the entire lower floor of a doubledecker couldn't have moved upstairs). I didn't look like I needed one until the stick. It was just the capping off of a bad day with worrying I was going to have to get off and wait for another bus as I wouldn't be able to stand and I was already freezing and in a lot of pain and it was half an hour to the next bus.
There is a general problem though with buses round here, really not very disability friendly, it's like a freeforall to get on at busy times (I nearly got pushed over earlier), the drivers often won't give you chance to sit down before moving off (often at speed) and with seats, especially people putting bags on seats and blocking them off, cigarette and dope smoking and antisocial behaviour too. I start work at 7am and finish early to miss rush hour as much as I can, similarly the school kicking out run round my way.