What's a service consist of?

[Jama]

If you can find a friend with a halfords trade card for a basic service it works out about £30
oil, oil fiter, plugs, air filter, fuel filter and replacement sump washer.

I work for halfords so we get 25% off

Fair enough, though I think on some items the trade card works out as more% off.
The plugs I got (bosch) were about £10 and came down to just over £5