I wrote:
Tesco also sell the Redex stuff (bigger branches only, presumably) for £8.
My local Morrison's also sells one for £5.50 or thereabouts, but it's not one of the bigger brands (CarLube, or something, I think).
Noticed Tesco Extra in Dundee selling the Redex DPF cleaner for half price at the moment, so at only £4 maybe good idea to stick one in the boot as a precaution in case DPF light comes on, and this stuff should help burn off the soot.
The Carlube stuff that I mentioned being sold in Morrison's for £5.50 is also a good price, because Halfords were selling it at £9 at one point, although not sure if Halfords sell it now (mostly Wynn's on shelves of the Dundee branch) and not sure if Morrison's stocking it now either.
https://www.halfords.com/motoring/engin ... er-cleaner