I've found an arguably better web site for the Megaman 11W GU10s... www.gil-lec.co.uk. The direct link is:

http://www.gil-lec.co.uk/products/Lamps/Group+4+-+Energy+Saving+Lamps/Low+Energy+%27Regular%27+Lamps/Megaman+Low+Energy+GU10/Megaman+11W+GU10/3613446374

They are £8.07 each, including VAT. Free delivery on orders over £30, so you could buy just 4 bulbs, incl. delivery and VAT for just over £32. Good if you don't want to buy in bundles of 10 on the ryness.co.uk site.

The www.gil-lec.co.uk has excellent prices on other bulbs too, such as the Megaman R63 11W reflector, at £8.87 each incl. VAT.