Pond Electrics Question

Hi
I am thinking of getting one of the standard three way weather proof
switchs to control my lights/pump/water feature etc. However, on the
instructions for my Hozelock pump it states a residual current device (RCD)
must be used. I can't see any mention of a RCD being included on any of
these switches, so do I need a separate RCD and if so where would I attach
it, the external cable is currently linked to a fused switch inside the
house.

Thanks,

Will