What happens if I sell my house after installing a WPL Diamond wastewater (sewage) treatment plant?

What happens if I sell my house after installing a WPL Diamond wastewater (sewage) treatment plant?
England:

According to the Environment Agency in England, if you sell your property, the new owner must be informed of your wastewater (sewage) treatment plant in writing. The information in your writing must include: a description of the treatment system and drainage system; the location of the main parts of the treatment system, drainage system and discharge point; details of any changes made to the treatment system and drainage system; details of how the treatment system and drainage system should be maintained, and the maintenance manual and records if you have them.

Scotland:

For further information, please contact the Scottish Protection Agency here.

Wales:

For further information, please contact Natural Resources Wales here.

Ireland:

For further information, please contact Ireland Environment Protection Agency here.