 Allcock's session career included more than 200 albums, including Robert Plant, Beverley Craven, Judith Durham, Breton guitarist Dan Ar Braz (six albums), Ralph McTell, Dave Swarbrick, Cat Stevens, and Dafydd Iwan.He began producing Welsh music in 2005 and has produced ten albums for Sain Records in Caernarfon.He was UK bass guitarist and tour manager for Nashville songwriter Beth Nielsen Chapman.