I would post this question on a UK based forum. You'll get a better response. State side there are a lot of angels. The Pasadena Angels group funded some deals like this.
It may not be for you, but it might be for the people on the other side of the equation. Relocating to the US is not as easy as you might think, unless you've already got citizenship/a green card.
I'd recommend you look local; many Angels like to fund projects close to home, wherever that might be.
Are you close to Cambridge, perchance? There's a nice startup community there.