Mr Angry wrote:
Question: Is an old banger in perfect mechanical working order with say 2 month's MoT worth the same as an identical car (for comparrison purposes) which has 11½ months MoT?
No.
If you are talking real old, "will it last me 12 months" type bangers then the length of MOT is critical.
You buy them on the grounds that you will get to the next MOT and have to either scrap it and buy another or pay the equivalent on repairs.
Insurance comapanies will always undervalue a car in the hope that you will take it without an argument. Tell them you are not accepting.
Another thing to think about, find out what they think the car is worth now and ask to buy it back from them at that price. They are usually more than happy to let you have the car since it would cost them to dispose of it. You could then have it made roadworthy at a fraction of the cost.