Bovingdon.
Now you have stired up the grey stuff.
The Italian embassy had a SM-109?? based at Bovingdon for their embassy. It never moved, looked like an Anson, and had wicker seats.
The french also had a Nord 1002 at Northolt for many years, in the '60's, that also never flew. It was run once a month by a french air force Warrant Officer of some sort.
Brian.