Answer

Firstly congratulations on your newly installed conservatory I hope you enjoy same.
First check that your concrete conservatory floor is entirely free from dust and any flaking, or loose material. If the surface is not absolutely flat, if there any visual bumps and depressions, this surface will need attention before laying any type of tiles, I would recommend, that you apply a self-leveling floor screed compound.

This can be bought in bags from a builder's merchants or local DIY outlets. It usually comes in a bucket or drum of latex liquid with which the powder is mixed to produce an easy flowing creamy consistent liquid. You then start to pour the liquid onto the floor and pushed the solution around with a plasterers trowel until it self levels. The liquid will now start filling in any small depressions leaving a perfectly flat, smooth surface.

It is not necessary to seal this surface and it gives excellent adhesion to all types of flooring adhesives.

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