He later became the vocalist/songwriter in the Hawklords, alongside Jerry Richards, Harvey Bainbridge, Dave Pearce and Tom Ashurst.
Prior to joining Hawkwind, Tree played with 2000DS, Plato's Jacuzzi, Captain Jesus and the Sunray Dream (who released two limited-edition "private press" LPs), and his own band, Bastard.
He contributed vocals and bass to Bajina in 2000, with Dino Ferari (drums) and Judge Trev Thoms (lead guitar).
!, built around a session of three tracks recorded 29 November 1977 at Pathway Studios, London, by Took with Ferari and Thoms; that album was released on 10 August 2004.
Hawklords have annually released an album, namely; We Are One (2012), Dream (2013), Censored (2014), Re:volution (2015), Fusion (2016) and Six (2017); although Tree did not appear on the latter.