Investors will want to know what you have put into it and risked, that's a big factor to getting an investment, if your not going to risk anything, why should they.
First off, try these, have a look at proposals and maybe submit yours, i'm not sure of the cost, probably under £100

i can't post links, so search these two in google) Angelsden, Angelinvestment network
Secondly, speak to the people who will invest: Search for
beerandpartners in google
Have a chat over the phone and they'll soon point you in the right direction