If the tap is in the bathroom, there is an isolation valve (which looks like a tap-head screw) which can be turned off. Put an old towel around the leak or a container under the leak to catch any drips and stop the water causing further damage.
If the tap is in the bathroom, there is an isolation valve (which looks like a tap-head screw) which can be turned off. Put an old towel around the leak or a container under the leak to catch any drips and stop the water causing further damage.