Eastern National SD2382, WNO483, Bristol KSW / ECW open top. New 1953, converted to open top May 1966.
Seen at EN's 50th Anniversary Celebrations in 1980, by then this vehicle had become a showbus, note the non standard red fleetnames. Sadly 2382 was destroyed by a fire at Prittlewell depot the year after this photo was taken, but, on a positive note, sister 2383 currently remains with First Essex 25 years later.

Photo taken by Eric Thompson, June 1980, Central Works, Chelmsford