I tend to buy most of my cleaning stuff from here;
Reasonable price,
£39 for a wheel brush.
Keith, assuming you're referring to the Wheel Woolies; you get 3 for £39, which if my maths is correct, works out at £13 each, not £39 for a single brush. Can't speak from personal experience of usng them but I've seen some very good reviews of these by members on various car detailing forums.
Just to add some balance, I think you'll find you can also get wheel brushes off the Clean Your Car site for £6 - £7, which I would consider to be a reasonable price.
Clean Your Car website, like other similar sites, has a wide ranging customer base, from the serious car detailer to owners like me and, I daresay, many others on this forum who just like to keep their cars looking good, and who like to have access to a wider and better range of products than you can get from Halfrauds, with prices to suit different budgets. I think you'll find that many of the products on this, and similar sites are no more expensive than you'd pay at Halfords, plus, you get door to door delivery. At the end of the day, you pay your money and take your choice.
Some people would say a Golf GTD is expensive compared to the competition, but It didn't stop you (or me) buying one!