arrived home late last night and there is an electrical burning smell in my bedroom. I managed to sniff it out to a double wall socket and unplugged everything. There's no scorch marks on the socket and everything is still unplugged but the smell remains... advice would be appreciated as i have to go out soon and other than sitting staring at it, i don't know what to do. am tempted to turn off the upstairs electrics while i'm out ... i also need to buy batteries for the smoke alarms (i know!), but what can/should i do about the socket?