PHILIPS Hue Colour Wireless Bulbs Starter Kit B22 at PC World ebay site, about £1.50 cheaper than the recent Amazon deal (although that has now gone back to £149 at Amazon). Includes free delivery.
So this makes it the cheapest way to get the hue colour ambiance system from a reputable retailier. 3 colour (also operate as white) amiance bulbs with the B22 Bayonet system (most popular system) for ceiling fittings in the UK - plus of course the bridge to get you started. The bulbs retail for £49 each and the hub between £39 and £49.
Listing is for "new - other" - sounds unused but possible open box or damaged box.