Just had mine extended to December. I could have had the test done but I thought I'd take advantage of the extension anyway. My car does less than 2,000 miles each year (and it will be far less this year as I've missed out one of the long trips I make due to lockdown).

The MOT on one of our cars ran out on the 15th June but I had every intention of having it done as normal. But then I damaged my ankle and was unable to drive so that did not happen. The tax expired at the end of May so I put it on SORN. The .GOV site says its on SORN but the MOT date is shown as 15 December, 6 months after the original date so the system has correctly updated.

I doubt if the government would change the date on the MOT's that have been extended. Some people will have bought cars with 6 months MOT without realising its a "free" extension, if that extension were removed they could unknowingly be without an MOT.

On the other hand its a great way for the Government to get some revenue, how much is the fine for no MOT?

Now I am driving again I will be taxing the car next week and will MOT it ASAP. Was fine before lockdown but if they pick up any bits that need attention I would much prefer to fix them on the drive now than in December.

BBD, the MOT would have been extended by six months a week before the 8th May (if that is the 3 year anniversary). It is now due in November whatever the changes to the lockdown arrangements. That is why they introduced the rolling extension rather than giving all cars a six month extension - it allows them to stop the scheme whenever they deem it appropriate.