Ikea - £280 Frame, £70 for the slats (upgraded to the best ones - Buying an awesome mattress is pointless without good slats to put it on), and £300 for the mattress, which is a pocket sprung with memory foam top layer (HYLLESTAD). Euro King size (200 x 160)
It is the most comfortable setup I have ever slept on. Instantly started sleeping better when I got it. 6 years on and still love it.
The equivalent slats are now £130 but think the rest is similarly priced, although I think they don't do Euro King any more if I remember rightly. Which is annoying for when I need to replace the mattress.