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Further update: the good people at Northwick Park hospital have managed to sort the catheter issue, and my dad is asleep, and hopefully recovering. That's all I'm going to say for tonight - it's been fairly traumatic - but thanks to them and thanks to you all for your support.
Hope your Dad gets out soon, feeling better....in situations like this it is cruel to not allow a carer/relative and thankfully that was resolved..my Mam is in a care home and I imagine the worry and stress must have been very tough. Love from, a stranger 
