The height adjuster has stopped working on my drivers seat.

Mk2 2008.

The lever moves up & down, but without the feel of any pressure to move the seat, any ideas as to what the problem may be please.

Haynes manual is no help,  other than just tells you how to remove the seats.

I think that will almost certainly be your starting point, anyway...

It sounds like the linkage has either drifted apart or broken, somehow and removing the seat will be the most likely way of looking closely at the issue. As its quite an early model and may have had lots of cranking done, it might be just as easy to source a replacement seat, providing you can find the matching upholstery. 

This might prove easier than stripping down and repairing the seat, unless its an obvious simple disconnection and you may find a seat from a car that has covered less miles and be in better condition. (I am taking a punt here, based on the age, but much later will most likely be different seat covers).

Thanks for the response, I will remove the seat (I belive the battery will have to be disconnected due to the seat having airbags) & see if its an easy fix or not?

Luckily it's not a big problem if I have to leave it in its current position, just that I'd prefer it to be working.