http://www.ebay.co.uk/usr/masterx-86
I always buy discs, pads, suspension... driveshafts... cv joints and exhausts as well as Lucas timing belts off my local motor factor.
they have a ebay account and all transactions done via paypal and they give their own PDF business receipts too.
they use good brands like shaftec, Icer, Al-ko, Lucas, Ashika, Suplex and so on... everything is OE branded.
i get tyres from these two places:
http://www.wheelrubber.co.uk/
http://www.tyreleader.co.uk/
Just enter your reg and your correct size appears etc