Sellie1981, good evening.
I notice this is your first post in here, If no one else does Welcome, if and when you need such Information, this is the place to find it.
As for your Question?
A/. There would be no possibility of fire, if indeed that was one of your concerns?
B/. There could be a possibility of creaking? or a ticking sound? should the Skirting touch the hot pipe.
Question? is the pipework Copper or is the pipe work clad with a plastic [Off White] material??
Rational for the above Question is that if the Pipe work is Copper then as the heat builds up when the Central heating comes on there is a Possibility that the natural expansion in the Pipes and the Radiator could cause the noise as described above?
If you have copper piping, then form a rounded groove in the Skirting so that the Copper pipe is free to expand and contract without being constrained by the Skirting, thus causing the sounds as described above.
In one of my Bedrooms, a copper pipe appears to be being "Pinched" as it comes up through the floor boards, and that is how I know about the noises that can be generated.
Hope this assists?
Ken.