groupon (and other similar companies) are good for discount pampering. even in london you can get an hour's massage for £20. I'm having my eyelashes permed and tinted in a few weeks via them - and looking out for a manicure and pedicure too.
i've been buying a lot of new make up and nail varnish, and rewarding myself with something impressive after every stone. Stone one was some vivienne westwood earrings, and i'm combining stone two and three to get a flash handbag.