I'm going through the process of renewal with the Met. Should take 8 weeks but they advised to apply 12 weeks before to be on the safe side. I was pleased to discover there is now an online system, and you're very much pushed to take that option. Paper remains available but if you choose that option, they ask you to explan why, and also they warn you it will probably be much slower. So yes, it took a while to complete the online forms, but so did the paper ones. Actually it's much faster as I didn't have to run around trying to meet countersignatories etc. The GP turned around the form within a week via email. I submitted a photo and within 24hrs they emailed me back to say it was the same one as last time and I needed to send a new one! Hey, can't fault them for not paying attention. Also paid online rather than posting a cheque and then not knowing whether they'd cashed it or not: I had a receipt immediately. So far so good. Then the Queen died, presumably using up all the police capacity for the duration, and they posted me letters to say they couldn't guarantee renewal on time, so here's an 8-week extension. Again, fair enough, I didn't have to do anything.
This week they called me to arrange the interview etc, and it's all via WhatsApp video call. They just asked me to WhatsApp photos of all the serial numbers, having first checked with me on the phone that they had the right guns on record. And it looks like they may complete the process on time after all. So frankly, for all the setup and legislation's fundamental flaws, they seem to have used the pandemic as an opportunity to put the online system in place and I'm rather impressed so far.
In summary:
Force: Metropolitan
New online application strongly preferred and encouraged (and faster)
Payment online.
All documents digital/scanned
Remote interview by video call.