As others have said, the 3 month warranty extension is poor compensation. If MMC are serious about maintaining / repairing their reputation then they need to look at this again.
The only other observation I would make is what lovely people you are on here! Too lovely. So many posts saying don’t be too harsh on MMC and be nice to the dealers because they have stock they can’t sell and we should feel sorry for them.
Whilst I agree there is no point blaming or having a go at anyone, both my dealer and MMC have my money. They are in a lot more control of the situation than I am and the dealers will have a lot more influence over MMC than I do. The only thing I have is c.£80k of unusable car sat in the garage. So right now the only people I am feeling sorry for are myself and the other 1273 people in my situation.