Found this deal at Robert Dyas a couple of days ago. Also on page 5 of their 'Up to 1/2 price Sale' leaflet. They had this same offer on a few months ago.
Buy any 3 Philips Energy saver bulbs for 99p.
Can mix and match any type of bulb (8w, 11w, 14w, 18w) and available in both bayonet or screw cap.
Normally £1.29 each!
Offer is available in store. Can't seem to find it on their website.
I already have all my lights on energy savers, but bought a few spares anyway. Hope someone may find this useful. Have not seen it posted yet and it's my first post!