i made an earth connection, about 1m long steel pipe, fluted it on the down end and bared all the steel on the top to put a wire around it and down the bottom about a foot of bared metal, currently making sure that the ground it's been staked into is nice and damp.

previously, there was 240V, it felt like, coming through my pc's case, and from the earth jackets of my USB devices. now, it's all nice, so i can also find where i put my under-desk earthing mat and be fully isolated