In case anyone is wondering, I'm still waiting. My MP followed up with the Home Office today and they couldn't give him an update (shocker). So, it's been just under two business days since I got my MP involved and eight business days since I made the initial escalation.
At this point, my family have assumed I won't make the burial, but have asked for their church to reschedule the memorial service for when we know I'll be there (looking more like next week at the soonest). The church have been really happy to accomodate, so that's something.
On the plus side, I did receive some really beautiful flowers today from one of my friends and that really cheered me up!