I went to the chemist yesterday to try and find some of the waterproof strapping that you recommended. He didn't really have a clue what I was on about (I'd forgotten what it was called by the time I got there!!) but recommended Zinc Oxide tape, which seems to be pretty much the same thing.
Anyway, I've put some on and have been walking around the house for about the last 2 hours, with NO rubbing at all!
Thanks again, I'm so chuffed that I'll be able to wear my lovely new shoes 