Distance of socket/switch from radiator?

[Possom]

The attached image represents a room with a tall vertical radiator (in red) and an electrical socket / light switch (green).

Is there a minimum distance 'x' which a radiator must/should be distanced from an electrical socket/switch? That is, to prevent any possible heating of the socket/switch?

Thanks.

 

[EFLImpudence]

No, but it will look naff if too close.