Thanks for such an informative reply. Sorry for the "asking for a friend" but I am genuinely doing that. They are not on this forum and need an answer today. I will pass on what you have shared and ask them to join and post their own question if questions remain. But, thanks again. Your quick and detailed answer is very much appreciated.
Has been working since September 2020, so assume it is an extension of stay, right? Been doing 90 day reporting since December. Is the visa not cancelled when the work permit is?
RTE London is closed for all visa applications until further notice. However, you can apply for a CoE. Once granted, you can then apply for a Non-B visa.