Yesterday I heard a bang/popping/crack sound from the kitchen, went in there and there was a smell like gunpowder, or burning 
The washing machine was on, and the fridge, nothing else switched on at all. Light was off I think. Everything was still working (washing machine running, continued to heat up, fridge still on), nothing tripped on the circuit breaker. A thorough look revealed no burnt marks on the plug sockets etc.
I had an electrical survey done when I moved in 6 months ago and all was well. Now who or how can I persuade to look at basically nothing, except the words "Well it bothered ME and yes I know there's nothing to see..."
Where should I go for advice?