The owner or occupier of any premises may serve a notice on a sewerage undertaker—
informing the undertaker that sewerage services to the premises are to be provided by a sewerage licensee, and
specifying the time after which the undertaker will no longer be required to provide sewerage services to the premises.
Where the charges for the sewerage services provided by the undertaker are, under Chapter 1 of Part 5 of this Act, fixed in relation to the premises by reference to volume, the time specified in the notice is to fall at least two working days after the notice is served.
In this section a reference to two working days is a reference to a period of 48 hours calculated after disregarding any time falling on—
a Saturday or Sunday, or
Christmas Day, Good Friday or any day which is a bank holiday in England and Wales under the Banking and Financial Dealings Act 1971.