I didn't get a letter. I assumed it was something to do with the new system and that I would be allowed to work once I got the BRP card. I had also just gotten a call that morning telling me my FIL was about to die that day (though thankfully he didn't) and I was trying to get back to the UK as fast as possible.
Ah, of course with your FIL’s health, it’s understandable that you were rushing to get back and weren’t thinking about the visa so much.
The only thing that has changed with the new system is that New York receives and scans the documents.
Everything else is the same - you need that letter to pick up your BRP (and you’re supposed to show it to immigration when you arrive at the border), so the fact that you didn’t get one meant that the wrong visa had been issued.
The best thing to do is follow the advice given on this thread and contact your MP ASAP to try to get it sorted out.
Sent from my iPhone using Tapatalk