Underfloor electric heating

Looking to put some under floor heating, in the conservatory, in the mortar bed under the tiles. Does anyone have any first hand experience, by that I mean, is it a d-i-y job (electrical connections excluded)?
I see that Screwfix do a system. Any comments?
http://www.screwfix.com/app/sfd/cat/pro.jsp?cId 2638&ts7984&id4441

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