Cremic (gloss finish ) tiles in London- advice urgnet

Bought a new house in UK- London and want to advice on Tiles laying.

I bought cremic tiles to lay in the sitting and dinning room. The floor is already concrete with carpet on it. I called a company to put in the tiles in couple of days. Since i have not seen their work, is it anything I need to keep a check on to ensure work bears a quaility results? -- The tiles I bought are are 20" by 20" wide and 3 mm thick. Floor is conctrete with anti fire sheet plus carpet. I am told the carpet and also anti fire sheets ( as they are soft) needs to be removed and then the people will check if leveling is needed on not. Is this the correct process and any other advice? Thanks, Sam,
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I'm in atl,ga usa.been in business 25+yrs. The need for references is universal.if they do good work they"ll be excited to get you contact info. your on the verge of a major investment in your new home. Insist... if they resist... be wary. a plane ticket and a couple of pints...i'l' fly right across the pond and fix you up lol good luck any good setter should be able to do quality install over a structurally sound floor system level or not.

brianmac
USA