R(Best) -v- The Chief Land Registrar and the Secretary of State for Justice  EWCA Civ 17
This adverse possession case did not involve a Gypsy or a Traveller but very occasionally you do come across Gypsies and Travellers who have been on land for many years where it is not clear who the owner of the land is.
The brief facts were that Mr Best had noticed an empty and vandalised property while working on a property next door in 1997. He had been told that the owner had died and that a son had not been seen for years. Mr Best entered the property and did work to it. He replaced ceilings and skirting boards, and electric and heating fitments; he plastered and painted walls. He did this intending to make it his permanent residence. He moved in at the end of January 2012.