I think it's one of the BBMF's aircraft, possibly the MkV or MkII (probably the latter) in late 1970's / early 1980's.
the engines and props fitted at that time were later Merlin 60 series, and paint was gloss, to keep them clean.
That said, it mat be an ex - BoB movie Mk,IX, painted a MkI for BoB anniversary in the early 70's, possibly even MH434.