I bought a car 2 mths ago which was taxed,I now get a letter telling me the chq previous owner sent is unpaid?

I received a letter from the post office asking me to repay (as I am now the registered keeper), the chq previous owner used came back unpaid,can someone please tell who is responsible for this, as I bought the car in good faith, believing car to be taxed, also why has it taken 2 months for post office to send out... show more I received a letter from the post office asking me to repay (as I am now the registered keeper), the chq previous owner used came back unpaid,can someone please tell who is responsible for this, as I bought the car in good faith, believing car to be taxed, also why has it taken 2 months for post office to send out a letter for unpaid cheque?
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