I've just recenty had quotes for a 30k service for my LC!!

Seat Perry's Aylesbury - £150
Seat Stoneacre MK - £109
Seat Watford - £195!
Skoda MK - £170.
Skoda Aylesbury - Still waiting

From reading the forums and my experience is does seem to vary depending on whether they quote for an yearly service or an actual 30k service. Not sure of the difference though.

£70 Does sound cheap to me.
 
Don't the dealers separate the annual inspection service and the mileage service, if the two are close they do them together and the total is cheaper then the two separate that others may do? Just make sure they are all quoting for the same job.