Everyone seems to be making all sorts of assumptions/guesses - which is hardly a basis for good advice, let alone for criticising others. It could well be a ring final, but, if it is, we appear to be talking about 'a spur from a spur' from that circuit - which, of course, would be non-compliant unless there were, indeed, a 13A fuse prior to the outdoor socket. We also don't know what cable is connecting the main circuit to the outside socket. If it's 2.5mm² then, again, just from the CCC viewpoint (apart from the informative Appendices of the regs {aka 'good practice'?} and the matter of point loading of the {assumed} ring), it would need to be protected by something more modest than a C32 if it was going to be supplying more than one socket.
Nope. Of course, they might be OK on at least some of the circuits.
Quite so - albeit, as I implied in my last post, not necessarily impossible. (as I said, we seem to know nothing about cable sizes!).
It could - although, as westie is always pointing out, nothing says that the Ze of a TN-S supply has to necessarily be anything like as high as 0.8Ω.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local