Thanks all. The sandals arrived today and I'm very impressed with them. They certainly straighten out my gait. I only wore them for a short time (as recommended) and found that even in that time walking didn't hurt my hip. It felt like a miracle! I've now ordered some trainers as it's not really sandals weather. DH impressed and thought they looked very nice. Not 'orthopaedic' looking at all.
BBC Radio 4Extra Scheduling Shake-Up.