Do not go back into your home until the police or emergency services tell you it is safe to do so.
Contact your insurance company as soon as possible - many of them have 24-hour emergency helplines. Find out how long it will take for them to see you, and check whether they have a company that will clean your house, or whether you will have to do this yourself.
Discretionary Assistance Fund (DAF)
The Discretionary Assistance Fund (external website) provides two types of grant that you do not need to pay back.