"A conveyance of land shall be deemed to include and shall ... operate to convey, with the land, all ... liberties, privileges, easements, rights, and advantages whatsoever, appertaining or reputed to appertain to the land, or any part thereof, or, at the time of the conveyance ... enjoyed with or reputed or known as ... appurtenant to the land or any part thereof."
- Section 62(1), Law of Property Act 1925 -
i.e. once an easement has been established it remains in place in perpetuity.
Chris