We got ours (solid wood) from B&Q after looking at all the 'posher' places. My carpenter said it was an easy lay (snigger) and it still looks great 3 years on. They had quite a lot of choice from what I remember. Was still pretty expensive......,
I can recommend UK flooring direct. They send out samples to help you choose. They were very helpful when I realise that I needed to order my floor in order for it acclimatise about 5 minutes after someone else did and they ran out of stock. The found a replacement that was slightly narrower but could get immediate stock. Delivery was good as well.