I've just installed outdoor sockets on the side of my brick shed, where previously we just had a double socket inside the shed itself. The original socket in the shed is on a spur from the ring main for the downstairs sockets. This is hooked up to a breaker in the main consumer unit in our basement.
Instead of just splicing that spur into two for the shed socket and outdoor socket, I installed a secondary consumer unit in the socket's old location and ran the shed socket and outdoor socket from that, on separate breakers.
The new consumer unit has an external screw terminal for attaching a ground point. The manual mentions that it is an optional feature. I do have a clad copper water pipe going through my shed, to which I could potentially attach a grounding strap, but I'd rather avoid doing so if possible because it's not really near the consumer unit (it's about 4ft away) and the area around the pipe is currently inhabited by an annoyingly large and confident spider. I'm pretty sure she's been eating the others and I am not a fan.
Everything currently works. I've verified ground continuity all the way from the incoming feed to the outdoor sockets. I'm just not sure if I need the additional ground connection. Must I face the spider, or can I shy away from battle?