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I want to embed my loose wire underfloor heating in self levelling compund.I have seen many one part compunds that claim they are ok for underfloor heating but when you read the small print the compound is for above or below the wires but not for embedding. Do I have to go to a 2 part self levelling compound to embed my wiring ?

We just self leveled a floor , it was ruff as . And then taped the wire down and self level over the top again

Apparently it is a really critical process. You have to put insulation boards on top of your concrete floor(use flexible tile adhesive) or most of your heat will go downwards and take ages to warm up. Then the wire is taped to the insulation boards and then the correct leveller poured over that but not any leveller, one that is flexible with a two part system or a single part leveller with the correct polymers and fibre strands in it. it has to be the correct depth and the mix ratio spot on or it will crack(like mine has for about a quarter of the floor.
You have to make sure it is not laid in too hot conditions or it will dry out too quickly and crack.
With regards to leveller on top of leveller, the manufacturer says that the first layer of leveller should be sealed if it has been left for any time at all before you put the next layer of leveller on.The reason for this is that the initial draw of moisture when the second layer has been put down will dry it too quickly and it will crack.
As if all of this is not enough you then have to use the correct adhesive for the tiles, one that is flexible again with the correct polymers and yet again the top layer of leveller should be sealed.
This floor has been a nightmare and I will never do another underfloor heating system.

I used Ultra floor 'level it 2' last time I did that, if I remember rightly. You sound like you don't want to use the 2 part slc. If it's about the application, level it flows really well (especially at 10 mm thickness). Plus the liquid is already pre measured which makes life a little easier.

Insulation boards, adhered using flex adhesive and screwed with accompanied penny washers. Feather the board edges with the adhesive used to fix them. Then prime the boards ready to receive the self levelling. Leave to dry.

Plot out the wiring, tape them down. You'll also need to cut a channel in the insulation board to position your temp sensor that goes to your thermostat. Feather (with some adhesive mix) or tape over the channel once you've installed the temp sensor. You can't cross the heating wires with the temp sensor wire, so position the TS before you plot out the heating wires.

Once all that's done, cover the lot with 10 mm of relevant self levelling