As far as I recall, India Four Two, the RAF never operated the Heron? The RAF always wanted it's own name for every type, even straight purchases of an existing civil model. Where the RN operated a common type with the other service, they would prefix it ""Sea" as in Sea Devon. On operational aircraft, " Sea" meant fitted with hooks and heavy duty undercarriage for shipboard flying, but in the case of the Devon/Sea Devon it was "ours not theirs"!