Got my car back from having the the drive belts changed (4.4 TDV8) and the heater is not working properly. Could it be conected to the repair or just coincidence? The front was taken out, grill radiator etc. to replace all of the belts, pulleys and tensioner/idler.
The fan does not seem to be blowing fully, if at all. No warm air is coming from the mid level vent unless I manually switch to centre vents only. If I hit the defrost button all seems to work normally.
Could a pipe of not been reconnected? Could a fuse be blown? Any thoughts?

I would ask whoever did the work if it could be related, is the air coming out cold as the cooling system may need bleeding more or is it hot but not blowing fast enough?

Sounds very much like air trapped in the heater pipes. Mine has LPG so the heater pipes are taken up to the pressure reducer to warm the lpg and that means the pipes are high in the engine bay where the air collects. When bleeding the cooling system I usually have to loosen the jubilee clips to let the air escape and then my heaters work (and the LPG too).

I suggest take it back to the garage and have them bleed it.

Zeus 2004 4.4 V8 Vogue

The garage came and collected it today, they seem keen to resolve it.
Thanks for the replies.