Ah, yes.....
What should you do? Look in the back of ERSA. It's not a case of 'what do they expect us to do' it is a case of they will know what to expect of you becuase you will act in accordance with the published radio failure procedures.
I agree, not the ideal situation and believe my things are trying to be done about it. The coalface guys and gals are also unimpressed, I believe.
Cheers,
NFR.