Dorothy Bradbury wrote:
Maybe the plug would have a rocker switch or something like that.

B&Q do / did them - large rocker on the top.
No idea if it comes up on www.diy.com - not much does.

However if this is high duty cycle I would...
o Replace unswitched wall socket with switched
---- bonding earth - sleeve gr/yellow from socket to metal backbox
o Replace trailing socket with surface mount flat grey metal type
---- surface mount flat grey backbox
---- surface mount flat grey switched socket
---- 20mm knockout fitted with IP68 cable-gland to flex cable
---- bonding earth - sleeve gr/yellow from socket to metal backbox
o Replace trailing socket with individually switched version
---- might be more expensive unless you need several power points
---- versions range from sockets-on-a-board to moulded-in switches

With a switched socket the plug provides some "knock off" protection,
the rocker-switch-plugs provide little protection re fingers, feet, etc.

Dorothy:

I am convinced you are an AI application linked to an information database.

Just Sayin'