Thank you for replying. I have viewed that page previously and do not see any clear instruction regarding YMV.

As mentioned I have contacted CIH, VFS Global and UKVI and aside from templated responses that are irrelevant there is no information forthcoming.

I was fortunate enought to get a YMV and was due to land in London in time to get a BRP before the deadline in May 2020. However with covid I am unable to travel to London from Seoul. So I have missed that deadline and now do not know what is to happen to my visa. I can but hope that they will allow...