Is it possible to bootstrap such a startup? I'd expect the fees to trade directly on the LSE or other markets to be prohibitive, but is there potential to trad

Is it possible to bootstrap such a startup? I'd expect the fees to trade directly on the LSE or other markets to be prohibitive, but is there potential to trade through another execution-only stockbroker? From Quora answer re. financial trading APIs in the UK (http://www.quora.com/What-APIs-are-available-for-automated-financial-trading-in-the-UK http://www.quora.com/What-APIs-are-available-for-automated-f...) deposits of the ones mentioned appear to be on the order of £10k+ and if it'd be legal to perform trades on other's behalves.