In reply to Stone_donkey:
Covent Garden shops carry tiny ranges and nothing specialist. Good places if you want to drop £400 on an anorak though.
I can't remember exactly what Rock On stock but it's a good range. 10 minutes from Mile End tube as your man above said
Urban Rock is good for Sportiva and has a few Scarpa models. 5.10 vcr only and doesn't stock evolv. Not central.
Cold mountain kit has a good selection of 5.10 models including the new Whites. Also a good selection of Sportiva and Scarpa. They stock a couple of evolv shoes, and Tenaya and Boldrini models. 10 minutes from Tower Bridge.