Clyde Valley/Carbon Zero Racing 3rd car?

The team have yet to pick up their actual racecars, but there's already talk of a third machine for the Scottish squad:

The team plans to run two Seat Leon Cupra racecars on bio fuel and, if funding can be secured, introduce a third car with an engine which will run on bio-methane - a waste gas more harmful than CO2 but when burnt releases near zero CO2.

http://www.eemsonline.co.uk/news/20-06-08_2