[1] Roberts claimed for a number of years that he had stumbled across Matthews busking in Cardiff and offered her a guitar string she was missing,[2] which led to their collaboration.
Their split ended their songwriting partnership, and subsequently Roberts was responsible for much of the band's lyrical output.
In Catatonia, Roberts shared main songwriting duties with Matthews, whilst also playing guitar and providing backing vocals.
After Catatonia split, Roberts worked as a record producer before co-founding Welsh rock band Sherbet Antlers with former Catatonia bass player Paul Jones, together with John Griffiths and Kevs Ford from the Welsh dance pioneer band Llwybr Llaethog.
By 2012, Roberts had formed a Cardiff-based soul-inspired band The Earth, with Dionne Bennett (of The Peth) and Dafydd Ieuan (of Super Furry Animals).