Hi, top tiles or b and q or wicked have lots of suitable floor tiles. Underfloor heating is suitable for any floor tile up to 15mm
The only way to prevent slipperiness would be to purchase a specific ‘non-slip’ tilewith an anti-slip R rating. It is likely however that tiles with such a rating will work out that little bit more expensive than without an R rating. According to some customers, they can find them hard to clean because of their rough texture.
In my humble experience, I have shiny floor tiles in both my kitchen and bathroom at home (polished porcelain) but have never slipped on either. However, by the office we have matt floor tiles and I have slipped on these on more than one occasion, so you just never can tell.
Customers are particularly concerned about installing shiny floor tiles in a bathroom because of the amount of water spillage. But how many people do you know get out of the shower or bath and step straight onto the floor? Not many. The majority of us have a bath mat and this will certainly prevent any unexpected slips.
If you Google buy r rated tiles you will find many sellers