I just completed my house renovation, the Elec I used fitted all incandescents during the work. Once I moved in I replaced every single one with LED which wasn't cheap at 8 quid a pop but I read it saves you a few quid in the long run. Obviously its gonna take a while to recoup the initial outlay, but hopefully they'll last a very long time.
I was sick of my old GU10 spots in my kitchen in my old house so I used LED commerical spots and they are fantastic no more changing GU10's every 8-10 weeks.