Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning BS 7671 and shaver sockets, and whether it would be safer to provide an external switch, is answered by SELECT:

Answer: No, a separate switch is not required. These units use electrical separation as the means of protection and any internal fault would be unlikely to lead to electric shock.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link:
https://www.voltimum.co.uk/consult.php?universe=consult.index.questions