This is one of the vehicles that took part in the Greater Manchester Transport Society's Trans Lancs Historic Vehicle Rally in Heaton Park, Manchester in September 1993.
It's a 1964 AEC Routemaster which was with London Transport until 1987 when it was sold to Clydeside Scottish of Glasgow in whose livery it appeared at this event. A note in the programme of the event reads as follows:
'AEC Routemaster, Park Royal H36/28R, 1964 ALD913B
London Transport RM1913
Entered by Messrs Bentley, Cannon & Worksnop, Halifax
Following service in the capital until 1987, this vehicle was sold to Clydeside
Scottish in Glasgow. It was purchased for preservation in 1991'
It later became part of London Transport's Routemaster Heritage Fleet.