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I use kinesiology tape, because Lidl had a set once going cheap. It's waterproof and very, very adhesive. Usually I put it on trouble spots with shoes that rub (or aren't broken in) and it works well. I also taped up every one of my toes with it once, after I stupidly wore shoes too tight and blistered half my toes. Ouch.
@hugo7 places like timpsons have the shoe stretching machines, that can apply a lot of force over time.... but I had a mate try with a pair I had, and we couldn't get a whole size.
Apropos of nothing, picked up another pair of Trickers from the Gloucester outlet store on Monday - leather soled shoes in a sort of DM profile. They are lovely and built like tanks but breaking in is going to be fun (lovely sore spot on my right Achilles tendon).