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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.
Airhead-
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
Has anyone installed a vinyl floor themselves?
I need one putting in my cellar, it's not square so there's quite a lot of cutting involved. Was planning to do this job myself, but now wondering if I should just get a pro to do it?