This looks like Carman’s Transport / Brit European to me - I don’t remember them running a Guy, but it looks like their ‘Ct’ logo on the door, and certainly looks like one of their ‘Brit European Transport Ltd’ tilts.
Re the white F86 - 6 wheeler on the same page- my best guess would Mike Prosser from Ross on Wye, but I’m really not sure.
Cheers Keith