Good podiatrist surgeon in London ?

I have moderate posterior subtalar joint degenerative change/osteoarthritis due to high impact injury that I suffered last year in August. I have been assessed with early Arthritis. I have been suggested by ankle consultant to go for orthotic to offload the subtalar joint. I checked with my insurance and they only cover if the podiatrist is a podiatrist surgeon. Any suggestions for good podiatrist surgeon in London ?
Thanks