The Sister who had pincusioned me on Friday wasn't on duty. I was to be poked by the head matron, then something happened and instead I was called to the chair by a young nurse. She tutted at the bruises left from Friday, poked at my arm a few times, said "Yep! Gotcha!" and pushed in the needle. Blood filled the tube immediately.
It was quick and totally painless. What a difference a little experience makes.