sofarris wrote

So how frequently should you get your house rewired?

When the wiring has deteriorated and you are getting nuisance trips.

Replace the CU if it’s a dinosaur with just fuses and no
RCDs at all or is clearly mechanically falling to bits etc.

Replace sockets and switches when they have failed
or when you want them to look decent and they don’t.

I don't think ours has been done in about
30 years as well. Should we get it looked at?

It would have to be affected by a house
fire or flood to need looking at at that age.