50% off at 500 London restaurants for a year. Also, I picked up a leaflet that gives you £20 off the RRP, use the promotional code TASTY and it knocks the price down to £49.95, for 12 months membership.
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I am not sure about the 'Treat Card' tip as posted earlier, they seem to have around 50 restaurants taking part, all of which are on with tastelondon - seems like they are trying to copy somewhat!