Yeah having a long warranty is nice but having to actually go through a returns process on a fitted item like that is not ideal.
For the light fixture most people (including myself) on this thread seem to be getting these:
http://www.toolstation.com/shop/Lighting/Fire+Rated+Downlights+Mains/Sylvania+Fire+Rated+Downlight+Fixed+GU10+Mains+Brushed+Steel/d220/sd3289/p13444
Adjustable versions are also available. Screwfix have better pictures but Toolstation are cheaper. They've been a couple quid cheaper than that also in the past if you don't mind waiting for a price drop.
I initially bought a couple white ones to sample as I thought they'd be more discrete when turned off, however you can't get a decent colour match against a white painted ceiling and they also have a cheaper look to them than the brushed steel ones I eventually went with.
For bulbs, everyone seems to be getting something different. I would suggest sticking to "COB" based GU10 bulbs. They are a newer tech than the multi-led ones and are brighter.
I have two favourites:
Superflare: I've tried both dimmable and non-dimmable versions and they are great for general room lighting as they have a particularly wide angle for a spot light (rated 60 degrees but pretty decent to 180) meaning 4-6 bulbs is adequate for most rooms.
Lightrabbit Superior COB: Similar to the Superflare in spec but with a narrower beam angle and a brighter "spot" where it's pointed so ideal for kitchens and cupboards perhaps.