The idea of part m is to make things acessable for disabled persons agreed ?
To apply part m to one particular outlet whilst the rest of the installation does not comply is not any help to the availability of acess for any future disabled occupants
The intentions of part m shouldn't be mixed in and mangled with the requirements of BS7671
New builds and possibly extensions,depending on the building inspectors take on the requirements are relevant
Rewiring of existing installations as stated previously,need make the compliance no worse
The skirting socket I believe, does not require any reference to part m.but I personally do not like outlets mounted on flammable surfaces,also where there is little play for the flex of any thing plugged into it
Sockets mounted on skirting boards are unsightly and make the job look amateurish,why not raise the socket and fix it to the wall ?