Laying the boards is straight-forward - I laid them over existing boards, having made sure all the services below were up to scratch! The boards fit together well, sometimes a little gentle persuasion was needed with a block & hammer, but nothing serious. I nailed them down and put a little light wood filler over the nail heads. A whole room (approx 4m * 4m) took about 4 hours to complete, but I did have an electric mitre saw which made things easier.
The boards come unfinished, I gave them 3 coats of Ronseal Diamond hard satin clear floor varnish, applied with a sponge roller, sanding lighly between coats.
The result is a beautiful wooden floor, warm on the feet and easy to maintain. They boards are quite robust, although I suspect they might mark if you were to drop something really hard on them, which is why I wouldn't recommend them for heavy use areas.
Hope this helps, I have no affiliation with wickes whatsoever, I just think this is a very good value for money product.