Bolton Corporation 142, PBN660, a 1961 Leyland Titan PD2/27 with full fronted MCW body.
The bus had lost its fleet names and numbers following the creation of SELNEC PTE. This style of bodywork albeit with rear entrance bodywork was much more typical of Blackpool where there was a long history of full front buses.

Photo taken by Chris Hough, 1971, Bolton Bus Station