I notice that a lot of multi-way extension leads have surge protection built in. Is it possible to get a surge protector which can be permanently wired into the entire mains supply in the house?
Yes it is, Hager make MCB sized surge arresters, as do Merlin-Gerin and, I believe, MEM Eaton. These can be installed in an existing Consumer unit, or connected in their own enclosure.
However I would take professional advise or do a LOT of research before installing such devices in an installation as they will need to be rated to the circuits you wish to protect, they are no cheap and installed incorrectly it could be an expensive exersice.
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