OK, this problem is now terminal.

The blower works but no air comes out of the vents, recirculating or otherwise. It appears the flaps are not working at all to channel the air and either one (the main) or some or all are stuck shut.

Is there a schematic of where these flaps are? I could check their motors and see which one is wrong.

Any help would be hugely appreciated as it's really hard to keep the mist away from the windscreen without air. Thanks.