Surely every aviator has the responsibility to monitor the emergency frequency
..er, no - unless perhaps you are flying in somewhere like Germany where radio is mandatory. Boy, do they
hate GA over there! Crab, you'd love it. Meanwhile, where you're operating in the UK, radio is optional in Class G. If MoD documents don't explain that adequately, take a look at a UK Air Pilot or whatever they call the AIP back home on the Mudbank.