wiring a outdoor on / off switch

[stayclean]

have a water tranfer pump, whating to put a outdoor switch so i can turn pump on / off.
bought one from screwfix 1 gang 2 way switch
power supply is fed from a 240 volts plug sockets, is it possible to cut into wires and connect up switch to work this way
colour of wires for pump is
blue / brown / earth
connection inside outdoor switch are a L AND 1 AND 2 next too 2 shows a sign like this /
what im trying to do is control pump via on / off switch, not via a socket in my shed were i have to turn pump off

 

[wingcoax]

Yes it is possible to cut into wiresBUTany outside work is notifiable, even in your shed.