About 3 years ago we had a new kitchen fitted, which involved some mods to sockets. The electrician involved (under contract to B&Q) replaced the old wire fuse for the downstairs sockets with a modern circuit breaker. Since then the switch has tripped out three times, the latest being while we were away on holiday, ruining the fridge and freezer contents. The heating was programmed off whilst we were away and the house was cold and damp from the wet weather which prevailed. Could this have caused some earth leakage? The circuit breaker has a test button which, when pressed, trips the switch. Is this what it should do, or does this indicate that there is leakage? Suggestions would be welcome.