This single deck bus was amongst the entrants in the Trans Lancs Historic Vehicle Rally at Heaton Park, Manchester in September 1998.
It's a 1950 Guy Wolf with a 20 seat Ormac body. The programme of the event had this to say this about the bus:
Guy Wolf/Ormac 1950 SB 8155
Entered by Mr A. Niblett, Erdington, Birmingham
New to Alexander MacConnacher of Ballachulish, Scotland this vehicle spent all its working life with them being used mainly on a triangular tour service to Loch Etive Head and return, a trip of approximately 54 miles. Withdrawn and sold for preservation in 1970 the vehicle passed through several owners hands losing its engine to a Llandudno bus in the process, It passed to the present owners in 1981.
There's an interesting website about Guy Motors, though it doesn't appear to mention the Guy Wolf.