In my laundry room I have a wired in washing machine and tumble dryer,
connected via a RCD circuit. I also have a radiator, sink and toilet. I
believe that all the pipes connecting to the sink, toilet and radiator
should be bonded together. This will require me to take the earthing
wire under the floor, so it is a bit of a pain, but obviously want to
get this right.

Can anyone confirm my assumption.

Thanks, Tim