Development finance - residential - 100% - uk only!?

We are planning to acquire prime london property, redevelop it (various ways to signifcantly increase the square meterage, thereby increasing the potential selling price, and selling off asap after completion. we however need close to 100% finance for both the purchase of the property and the development costs (based on surveyors measurements). so far no luck whatsoever. any ideas? help!
Answer
Http://www.liba.org.uk/the reason you have had no luck is that you want too much from the banks with no or too little capital investment of your own.the high street bankers will normally go 50-50 with customers they have known for some time.you made need to use equity from any existing properties you have as security.to be honest i think you are on a hiding to nothing.your other options are to find investment groups but again you need some track record