I know many of us do not use Halfrauds because of the muppet staff, high price etc, but I did find a somewhat useful offer today for filters and the such like for SWMBO's car which needed a full engine service.
The current offer in my local store is 3 for 2 on halfords oil, air, fuel filters, ht leads, NGK spark plugs, and some other items which I cannot remember. Buy the most expensive 2 and you get the third cheaper item free. Managed to save a few quid over my usual local auto factor, so bought several sets.