I'll second that Iberdrola switched the neutral when they fitted the main circuit breaker to our consumer unit, nearly electrocuted the guy who fitted our AC
If you're planning on ANY electrical DIY (e.g. putting light fittings in) I would heartily suggest investing in an electrical test meter. That way you can check the wiring as you go, and ensure that wires aren't live when you're not expecting them to be!
.....or a Neon screwdriver....! Appliances do have reversible plugs but it is important that the live wire coming into the house is connected properly to the trip mechanism. If the live is on the neutral wire then the safety device will not work.
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