Call an emergency plumber for problems such as a burst pipe, major water leak, blocked sewer, overflowing toilet, or a gas smell. If water is escaping, turn off the main water supply if it is safe, and avoid using electrical appliances near wet areas. For a suspected gas leak, leave the property and contact your gas distributor or emergency services rather than trying to repair it yourself. Ask the plumber for their call-out fee, after-hours rates and a written estimate before work begins where possible.