In a move that other technology startups have also considered, PolyFuel has announced that they will be listing on the London Stock Exchange's AIM market for early stage companies. They will reportedly raise about 12M pounds at a valuation of 40M pounds.
Listing on AIM or other "venture exchanges" is an interesting new option for early stage companies that would ordinarily be looking at new private equity rounds. The jury is still out regarding what kind of treatment such moves will be given in the long run, what the implications will be for broader acceptance of cleantech investing, and what the implications will be for private equity investors.
At least for now, such listings generally appear to be being received well by the public markets, and they are also providing a nice opportunity for venture capital investors to gain some early liquidity opportunities and mark-to-market valuations.