Oops. I've just found this page on the New Alliance website, which basically outlines its history.
http://www.iits.dircon.co.uk/newalliance/const.htm
Looks like what I said above was mostly wrong.
ops:
The New Alliance was apparently an initiative by individuals, not parties. It brought together people frustrated by the division between UKIP and the Referendum Party. There is no mention there of the Green Party, so my memory must be playing tricks. Sorry.