Not the Herald - they had left the fleet by the end of 1966.
Thanks Dave... you always seem to have an encyclopaedic knowledge of these things
Certain about most of those types except perhaps the Heron as well (have seen it in late BEA colours)... so down to 9-10 types!
As of 1976...
BA
Concorde (if the types below were all still in operation around 1976 thinking specifically of the Heron)
Tristar
ex BOAC
747
707
VC-10
ex BEA
Trident
1-11
Vanguard (later Merchantman)
Viscount
Heron?