My above posting is ambiguous as the only reference I can find to IEC 60884-1 socket outlets is for European/Continental units.
A further reference states; Standards “ IEC 60884-1 : Plugs and socket-outlets for household and similar purposes- General requirements.
The UK equivalent appears to be BS 5733, BS 546 or BS 1363 Part 1. Many units conforming are clearly not of Class 1 construction.
Until there is clearer guidance from BSI or MHRA Robert's above suggestions make sense to me.
Bill