You are on the doorstep of harmony hq. Why not just ring and ask if they take walk ins? They probably do as I think it's also a training centre?
NAIL HARMONY UK (Master Distributor) | 0208 172 0595 or 0800 014 8313 | Unit 5 28-30 Fowler Road, Hainult, Essex, IG6 3UT
Alternatively Thalia distribution (who are the london & herts distributor) definitely have a shop at their warehouse in enfield:
Nail Harmony London | 0800 014 8231 | Unit 6-7 East Lodge Business Village, East Lodge Lane, Enfield, EN2 8AS
I don't know how long you're staying? But there's a half day vitagel seminar at the warehouse on the 17th with doctorate prof & global educator Thalia. You get a goody bag with vitagel/marketing stuff & entry is the price of 1x bottle of gelish :biggrin: