There is a lot of paperwork to complete. However, they started completing it from 16th December 2020. They didn't just start yesterday. So shouldn't take too long.
I would 100% say that the relist will replace the current list in your ISA, SIPP, etc. Nothing will change. And that is 40 years of trading/investing experience.
Well my take is that Copl should have been suspended in Dec 20 but Arthur managed to avoid it until now. I reckon we are just on the last hurdle. Going by today's RNS we are waiting on the group accounts to be completed. So my bet is now on 20 days instead of my 2 days yesterday.