Haven't been able to get tegaderm :S
Went to Boots in my lunch hour but all the dressings they sold had absorbent pads in the centre. Stopped at the local pharmacy on the way home, they had some "Mepore" that looked the trick.
I had treated it last night with a Melolin dressing from the first aid kit which I'd bandaged in place. That came off tonight without too much sticking
The thing is stiff and soaked in blood/fluid though :S
I then shaved the area, being careful to avoid blade on wound
and I realise why professional cyclists do this before falling off. I cleaned the area up with an antiseptic wipe, at which point I realised the ones I'd been carrying in the first aid kit had dried out quite a bit when compared to the new one bought today... OUCH!!!!
Once I calmed down and recovered I put the mepore on. It's not as good as I remember from last time, and didn't stick properly first time (maybe the wipe had left some residue?).
But there are now two of those mepores stuck in place, seem ok, so I've placed a large patch of lint over them and bandaged that in place in the hope that that will keep the patches in place instead of letting them start peeling off.
The arm is going to remain covered in melolin and sticky tape for now, until I see if these mepore things stay on overnight...