I too started work as a bus mechanic working for South Yorkshire Motors Pontefract ( although Pontefract is in West Yorkshire) a lot of bus enthusiasts used to turn up to photograph this bus. This info is from Dewsbury Bus Museum Website.
Technical details:
Chassis - Albion Valiant CX39N, 60309D
Body - Roe GO4561 (May 1958)
Date new - November 1950
TWY 8 is a rebodied chassis. The chassis was originally under a Burlingham coach body, numbered 57 in the fleet of South Yorkshire Motors, and registered JWT 112.
The chassis was used to construct South Yorkshire Motors (Pontefract) number 81 (TWY 8) in 1958. The double-deck body was built by Roe of Leeds to a L27/26RD layout. The original Burlingham body was fitted to South Yorkshire Motors 51, which became number 57 and registered as DYG 53. This vehicle also still survives today in preservation.
Following a full mechanical overall TWY 8 passed her MOT on 14th April 2010, some 29 years after the last one expired! Credit is due to Andrew Beever and a few other dedicated members for a year's hard graft.
The bus carried her first passengers on the 2010 Arriva Tour and continues to be a regular attendee at many local events and she continues to be a regular performer at our open days.