keep an eye out on the ebay/craigslist finds thread. some really good stuff do show up there. give us more idea about what you think is "decent". personally i always find decent frames on ebay going for quite good prices. loads of us here have scored 531 road frames for less than 60quid.
only other thing i can think of would be bike jumbles, but i do not know of any coming soon that's not too far away from london.
keep an eye out on the ebay/craigslist finds thread. some really good stuff do show up there. give us more idea about what you think is "decent". personally i always find decent frames on ebay going for quite good prices. loads of us here have scored 531 road frames for less than 60quid.
only other thing i can think of would be bike jumbles, but i do not know of any coming soon that's not too far away from london.