Nothing in this Act shall affect the payment or recovery of any yearly sum payable at the time of the passing of the Public Health Act, 1875, in pursuance of the Local Government Act (1858) Amendment Act, 1861, to any local authority in respect of any premises without their district which have a drain communicating with a sewer within their district:
Provided that any such sum shall cease to be payable if the connection between the drain and the sewer is discontinued, but shall again become payable if thereafter the connection is re-established.