True cos it happened to me:
In a Jetstream out of Culdrose on a Friday afternoon Navex:
Jetstream: "St Mawgan Radar navy 630 request transit the overhead at 2000' outbound on a Navex from Culdrose and returning to culdrose later in the afternoon"
SMG: "Navy 630 yr cleared as requested qfe blah blah blah...pause........Navy630, will you be coming over me again later?
silence from Navy630