You can get a perfectly good selection of products you can pick up from Halfords mate, don't be fooled by a lot of fancy packaging and pricing as your only option to make your car shine.
Personally, if I was shopping for stuff only in Halfords, this would be my choice :
Clay : Meguiars Smooth Surface Clay Kit
Shampoo : Meguiars Gold Class
Mitt : Meguiars Microfibre
Polish : Autoglym Super Resin
Wax/Sealant : Autoglym Extra Gloss Protection
Tyre Shine : Meguiars Endurance High Gloss Tyre Protection
Then get yourself a selection of microfibre cloths, drying towels and applicators. It's all about the pre work not how much you spend so something to remember.
If you do want to order online, I'm quite a fan of
www.shinearama.co.uk as their customer service is superb and their prices are good. Personally I lost faith in CleanYourCar.co.uk, ordered bits from them before and they missed out the odd small item, then when contacted just received no response at all.