The Chatteris parachute a/c talks to Lakenheath Approach (128.9) during the climb until just after the drop . Lakenheath usually relays an 'all stations' immediately before the drop.
They also talk to the parachute aeroplane at Old Buckenham.
Both a/c have been know to use the callsign 'Parachute 1 ', so listen out carefully for the airfield identification: at weekends they are often operating simultaneously.............
Cusco