Can anyone on here recommend a good retailer to try on shoes and have them fitted properly in Essex? I am taking on the Thames Path Challenge in September and I have problem feet! (over pronation) I've done quite a few moonwalks over the years (this year will be my 10th) in various cross trainers (last year I used Asics with goretex) and wear orthotics but am unsure whether to stick with these or get more of a walking shoe or trail shoe. I also suffer badly from blisters on any walks over 13 miles unless I wear lots of padding and tape. (have tried various socks and other suggestions over the years so getting something right to try and limit this is essential) Many thanks!