Aquascape
Whilst the MATZs of the aerodromes you mentioned are not
routinely open at weekends, this is not always the case. A check call on the relevant Zone frequency is always advisable as the airfields concerned could in fact be open. In this case a MATZ crossing should be available.
Note Marham has extensive gliding and light aircraft activity at weekends without ATC cover. The Fenland Gliding Club and Marham Aero Club operate on the Marham Zone frequency 124x150, as does traffic at some nearby airfields. As previously stated, you should remain outside the ATZ in any case. Normally gliders at Marham are winch launched to around 2000 ft.