I called up Nissan HQ and complained about the BCM going faulty on a car which has only done 30K, they called up the garage and after further discussion, they have decided to carry out some more tests to make sure it definatley is the BCM??!!?
They did say they might consider paying towards the cost/good will gesture depending on the fault.
Wait and see what they say.
Ps. good idea about wirning up the hazards to a relay and running it off a seperate circuit.