[Polestar Pete]

If you're handing the car back, then I'm not sure it really matters where you take it to get the service stamp as long as they use Volvo parts (as indicated by the lease company).

If Halfords can give you an itemised invoice with the approved parts listed, then I'd go with that if it's the cheapest option.

I think that there's really no sense in paying dealership (or good indy) servicing costs if you're only going to keep the car a few more months.