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Thanks this is really helpful, I hadn't considered tiles.
I was thinking to get a 4x5m roll, and just gap fill with off cuts in the chimney breast as shelves will be going in there, so it wouldn't be seen. One issue I had forseen was that I may not be able to get a 4x5 roll through the house.
R.e. floor, I have had builders in to remove the existing screed and hardcore, and lay a new membrane, insulation and fresh screed so the levels are bang on - although it's still going off so haven't 100% confirmed this but we did discuss what was going on top.
mustardbeak-
There are as always lots of variables! You can have loose fitted vinyl flooring on a roll. This is much easier than glued down. The glue down type I have used is the thicker type used in hospitals etc. This is heavy and stiffer so handling it is tricky, especially as the adhesive is very sticky and you can't paint the whole floor with adhesive before rolling it out. Would be easier with 2 people I guess. It's very durable though.
If you just have a loose fit the challenge is cutting the edges, not too difficult to do but depending on how neat a finish you need to satisfy any ocd it may not be easy enough. If you've just had a floor poured maybe you have no skirting yet. In which case, loose fitted with skirting on top is easy to cut.
Airhead
Tiles are easier than a roll, just easier to handle. You need to buy a decent quality adhesive. Preparation of the substrate is the most difficult bit. Usually you'll need a thin screed of self levelling poured over the top of whatever is there, then that needs to be carefully flattened and cleaned very carefully before you start. Any little bits can easily show through the vinyl. Self levelling cement doesn't actually self level all that well in my experience.
Not sure if you will find a roll wide enough to do the whole floor in one and making a join can be quite specialised (basically welding in situ). Tiles would be much easier to lay.