In article ,
Rich writes:

I want to have an extra socket in a utility room. The easiest way to
route the cable would be horizontally from an existing socket, then
neatly around the door frame, to the place where I want it. The room
has a solid floor and a solid ceiling. If I route the cable around the
door frame, as mentioned, has it got to be in trunking? I think it
would be neater without.

No, cables don't have to be concealed.
Actually, if they are concealed, there are restrictions
on where they are allowed to be routed.

--
Andrew Gabriel
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