Hi Tom,
Personally I'd try Richard even though he's no longer in charge of parts supplies and explain the problem you're having. He might know the reason or be able to push things along for you.
The only other supplier I've bought from is SJS and they've always been reasonable in responding to orders or emails.
It's disappointing to hear the experience of yourself & John, even if they can't supply or help I would think it only courteous to respond. Although in their defence they may not be working because we've gone into another month Covid lockdown over here. It's only supposed to be non-essential business that's closed but there's always the chance they're affected, especially if one of them or their workforce have tested +ve.
Brian