Pack of 10 warm white/ dimmable GU10 spotlights - 300 lumens/40W >50W £8.00 at Asda (Walsall).
Have to admit, find buying a replacement lightbulb these days a bit confusing - gone are the days when it was just a straightforward choice between bayonet,Es/ses fittings...Or, Is it just me??
Anyway, even though these are only halogens (I think LED's are considered a better buy?) thought they were good value at 80p a bulb.