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Unfortunately the next steps in diagnosing a problem like this should involve some reasonably accurate testing equipment.
What circuit is the top switch controlling and is it on or off? It looks like an RCD or RCBO that is switched off. I realise the switch below is on when down but most of the modern ones work the other way round.
Airhead
fredtc
given that the sockets have been working for the last 2 years I think I can assume it's not the wiring being wrong (or is that not what those testers are for?)