American engines are weeeeeell different to Jag's of the era...I have messed with both, U.S. muscle engines are easy-peasy.....
Let's face it, your crew took on more than they could deal with...????
Brexit wasn't Johnson, and Johnson wasn't Brexit, Johnson became PM and took over the mess made by May and her crew........
But of course now everything is blamed on Boris, what a surprise.....................
It sounds like the OP has a local "post" problem.
If I were the OP, I would send an email now and again stating not had a LC for a while.
I did that last year, they sent me one to download and send back. I also send an email every year with a copy of my LC attached, with a weeee note...????
At Ubon, I asked what I need to bring when my under consideration ends, they said,
"Just your passport"....
So, do this and see what they say, after all, you have for filled the 60 days in the bank requirement thingy......????