You have a choice - either agree in writing, so they're legally released from the 8 wk deadline, or else they have no option but to Refuse! That's how they see it anyway - very careful not to transgress any legality they could be hauled up for.

Yes me, ‘tis my job.
Unfortunate situation but probably easier to keep them on side during these times and just try and get a decision out of them as soon as possible. Keep in touch with them and make sure they have everything they need to avoid any more delays.
They are all working from home, struggling with remote working etc as we all are, and some will have caring responsibilities, kids etc to look after and home school.
You don’t have to agree, but appeals against refusals will also take longer.
LBC are often advertised in the local paper which they can’t do at the moment.
I for one am grateful that they are still processing applications because if they stop completely, my work basically dries up.
In normal times, the application will probably have been extended anyway for some other reason, minor change to a detail or something, so don’t sweat it. Good luck. Message me if you need any help!

In my experience you're lucky to get the choice - we had an application refused because the case officer couldn't get to site within the 8 week period. Even though I advised them that we would happily accept the extension they acknowledged this and then just refused it anyway as they were worried the 'deemed consent' rules would come into effect.

Many councils (including ours) are currently not accepting any applications at all, so best to play along and accept the slow grinding process.