I would have said you were on the right track with the blower motor, we sell a lot of them so they are definately a common failing.
Under the bonnet take the top of the climate box and disconnect the blower and try putting 12V to the beige coloured plug and see if you get any movement. There is also a blower motor control by the side of the blower motor in the same box (hedgehog looking device) responsible for regulating the speed of the fan dependent on airflow past it and this also fails resulting in no power getting to the fan.
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