Metro 1506 was a Plaxton-bodied Volvo B58 painted in the Hanson Executive livery used by West Yorkshire PTE for a while. It's the 1978 contest on 19th May and the band have got off, milling around the coach until it's time to march.
This coach had a long life, running with Buffalo Travel of Flitwick at the time they were taken over by Dunn Line in 2002, by then registered WXI 4357.