Electric under floor heating?

4 Sep 2013
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United Kingdom
I am looking to lay under floor heating in my bathroom.

The floor is just wooden floor boards and I plan to lay insulation/backer board, screw down and then lay the loose electric cable. I will then tile with a porcelain tile on the floor.

My question is what is the recommended thickness of insulation board to lay in order to achieve a good U value and to stop heat escaping into the sub floor?
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This is plumbing and central heating not electrical and the answer is look up the fitting instructions all the information will be in there.

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