Evacuate if you are told to do so by the Emergency Services
Turn off the electricity supply to the property until a qualified electrician or utility company has checked out the electrics. Use extreme caution in dealing with electricity. Ensure that all switches, sockets and appliances are checked prior to use, especially if they have been in contact with floodwater.
Once all electrical safety checks have been made, make sure that you use a circuit breaker with any electrical equipment that you may use to clean or repair your property. Watch out for any fallen power lines and do not approach them - be aware that there is always a potential electric shock hazard.
Be aware that the power supply may be interrupted for several days after a flood event.
Turn off the gas supply to appliances that have been flooded (or where their vents or flues may have been affected).