price for VP in london? first trip over, help pls!

Hi ladies, anyone living in london that can help me out with some pricing? I'm visiting london next week for the first time and would like to buy a pair of loubs (i live in the us now).

I'm just wondering if its worth it for me to buy it in london pricing wise? The black nappa VP 120s retail for 795 in the USA, how much is the equivalent or GBP cost in london? Is the cost the same throughout all the stores? Is there VAT or tax back?

Thanks so much for your help!!