I thought the single engined a/c ban was for everyone except the RAF, as i can remember some years back the French being refused permission to operate a single engined comms a/c into Northolt!. If it,s of any interest we also get occassional visits by Tucanos from Linton?,(LOP callsign),but the Hawks have become more regular visitors.....Now more likely to see one of those than a RAF Herk at Northolt.....How times have changed!!