Helpful, thanks....
If you need a 57 then fill your boots, but if you are after a 54/55 with plenty of build and component options that's in London, then please do make an offer.....
Oh come on. Scarcity of offers of a specific size only works as an argument for a higher price if people actually really really want that specific frameset. Otherwise, there's plenty of options out there that compare well to this type of frame, but don't necessarily cost close to £1k used.
Also, there is a new and unused (57cm) Time First frameset for a £750 'buy it now' price on Ebay. (Or £700 on their website)