Not quite right.
In about 1985, an Argentine Navy P3 visited Farnborough and stayed overnight.
Next morning it went off somewhere else, (can't remember where) and on return the CO took over the radio and read out a pre-prepared statement from the FCO stating that the aircraft was not permitted to land back at Farnborough so it diverted elsewhere, not sure but it might have been Brize.
Naturally it was all kept very quiet at the time but the local spotters noticed anyway.