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No best answer has yet been selected by LizB99. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.To the immediate issue of using the car, you could book it in for an MOT, since you are legally able to drive an untaxed/un-MOTed car to the test station, and when passed you can then tax it.
As to the main dealer I would certainly advocate making a big fuss and perhaps involving Trading Standards, the press and whoever else will listen.
HI
Might be a problem now you do not have the certificate to prove anything. Chase the garage for the certificate and then i would write a letter to the Dealer Principle with a copy going to trading standards.
I think it would be best to get it re-MOT'd as per Kempies suggestion as you could be fined. Ask the dealer to reimburse you for the MOT.