Eastern Counties VR258, RAH258W, Bristol VR / ECW H43/31F, new in November 1980.
Seen in Colchester, about to overtake a Colchester RE, with "Town Centre" on the destination blind - there seems to be more information on a sticker in the windscreen. Still in NBC livery, but without NBC symbols.

Photo taken by Eric Thompson, August 1988, Colchester Head Street