Hello Jazzy
From the previous replies it seems it's part of 230Vac system that's failed, and the fact that some sockets are working whilst others aren't certainly points to an MCB tripping in the consumer unit.
The MCB or Miniature Circuit Breaker is designed to turn of the circuit its connected to if excess current is being called for by some appliance connected to it. Is it possible you tried turning on some heating applaince that caused it to trip?
You do need to find the consumer unit, If its not under the front locker it may well be in the wardrobe. It should have three or possibly four switches in it, and one will most likely be turned off.
Something will have caused it to trip (that's what they're meant to do if a fault occurs) amd you mention the the under cabinet lights had stopped working, if they were halogen bulbs, its possible one of them may have failed, and when they go they often used to trip MCB's.
- Try resetting the MCB switch. If it it won't latch on, it means the fault is still present. -
- Turn off all the appliances, and then try resetting the MCB.
- If it holds, that means the appliance that's causing the trip is now turned off. -
- go round the caravan and turn each appliance on and off, until you find the one that causes the trip to operate.
- If you find an appliance that causes it to trip it simply leave it turned off until you can arrange to get it repaired.
- reset the trip and carry on.