Blowers not working front and rear

[Scrimja]

Hello! First post here but an ex regular on an E46 forum up to a few years ago.

I've had my e70 (2008 4.8i RHD UK spec) less than 2 weeks and the blowers have completely stopped working. No air front or rear, including the windscreen clear function.

I've done the required googling and forum searches but my problem doesn't seem to come under the regular FSR/blower regulator issue as I have no air front, rear or windscreen. From what I can gather the rears have their own FSR so even if the front FSR goes down the rears should still work.

Can anybody shed any light before I start replacing bits? Anything anyone can think of that might help me narrow things down?