Sheila, While I agree with Phils advice on switching off socket outlets is worthwhile, although I never do, other than TV/AV equipment, don't start to panic if your sockets or spurs are single pole, unless wired incorrectly which would be very rare, as the single pole switch on a socket will isolate the live conductor which is the one that could rarely cause a problem, I also would not leave my dishwasher/washing machine on if going out or to bed, although very many people do which is why they are often fitted with timers nowadays.
Todays domestic installations are far and away safer than years ago with MCBs and RCBs. that will trip much faster than fuses of the past if or when a possible fault develops