The top photo is definately a Plaxton 'Embassy'- bodied Bedford SB.
These simple vehicles were the mainstay of many independents' fleets, basically derived from the 'TK' truck chassis, and with many common parts.
Next is a Rowe 'Hillmaster'.
Rowe was a small (Cornish?) concern who made a brief foray into PSVs.
FWO 634 is, I reckon, a former Red & White Albion with Lydney Coachworks body, reminiscent of the contemporary Duple 'A-type' offering.
I'm pretty sure that the bottom shot is of a former Southdown Leyland PS Tiger half-cab rebuild.
The rebuilding involved lengthening to 30' and rebodying - all work being done by Beadle of Dartford.
Morlais Services eh? - c'mon Mr Splott, let's have a final fling of Western Welsh Tiger Cubs!