He played lead guitar with Strawbs (although he was never actually a member), The Overlanders,[2] The Crazy World of Arthur Brown, Elmer Gantry's Velvet Opera, The Velvet Opera, Tintern Abbey, Fire, Roy Harper, Al Stewart, and Lonnie Donegan.
His first twelve-string guitar suite, Earth Birth, was released on his own label, Phoenix Future, and was produced by artist Ralph Steadman of Fear and Loathing fame.
His K-tel Romantic Guitar album went gold in the United Kingdom, but Brett stopped recording soon afterwards.
[8] Brett also performed as a session musician with The Ivy League, The Flower Pot Men, Carter & Lewis, Hudson Ford, Johnny Joyce, Michel Polnareff, Max Bygraves, The Cyril Stapleton Orchestra, Lonnie Donegan, Ralph McTell, Neil Christian, Status Quo, Paul King, Barclay James Harvest, Tom Newman and The Overlanders.
In 2012 he set up and managed the annual Llyn Acoustic Guitar Festival in North Wales.