I’ve had two very good experiences here. First timers will have to pay for a membership(«gold card») to get any of the discounts, but it’s a one-off and worth it. The staff is knowledgeable and friendly, and for a small, central london shop they’re impressively stocked. Wait for discounts on standard items — whey, omega-3s — as the periodic sales are very good, 3-for-2, etc.