You might find this list interesting. http://business.timesonline.co.uk/tol/business/specials/article5816774.ece.
While I was giving some thought to the micro-investor question I got an e-mail from one of the people on the first page of the above list. I’ve known him for a while and had sown the FF seed with him. He tells me his brother has set up a company that looks to invest in “relatively early stage clean technology”. He has instructed them to look into FFS / LPP. I will keep you posted.