The Malaysian Air Force had the purpose built HP7 400 series, on retirement from military duties some of the aircraft returned to UK and were operated by BAF at Southend.
The last Herald operating in UK was G-BEYF, a former Malasian aircraft that retired in 1999.
On converting one of the 400 series to a freighter a weight reduction process was carried out, there was a very substantial wiring loom found running along the front spar, one theory was that the aircraft had loud speakers fitted under the wings to broadcast to the terrorists in the jungle.
The Herald was also pressed into military service during the six day war by the Israeli Air Force, the aircraft being operated by Arkia flying tourists to the dead sea at the time.