Trevor was a close friend and stayed in my house when in Brittany ( Quimper)in the mid seventies. I had released a few records in those years under my first name" Gweltaz" he took part in one in 1975 : "Bonedoù ruz" ( Musidisc-Europe FLD 646 ).I still have his 12 stringed guitar ( shaped like a lute) and his anglo concertina. Happy to have more news and give help if I can . arfurgweltaz@gmail.com