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
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.