Let me answer your question anyway because it’s always good to have a second opinion. If you have been on Google, the information that you have found, particularly if it’s come from a forum may not be correct.
If someone has occupied a piece of land without consent and without objection and not in secret they can claim the piece of land under the doctrine of adverse possession.
So if the fence was, for example, several metres into adjoining land and the person has gained the land treats it as their own for more than 10 years without consent and without objection not in secret and the property/land is registered at the land registry (12 years if not registered) then they can claim adverse possession of that piece of land.
So applying that to your scenario, if you are that this extra piece of land and used it as your own since 2006 and you can claim adverse possession of it.
You make the application on form ADV along with a statement of truth form ST.
If the land is registered under will get notice of the application and if they dispute that you have occupied for 10 years or more it will underpin the land tribunal.
What is important therefore is that you have proof which is unequivocal of your occupation for longer than the statutory period.
Thank you for letting me assist you with your legal question. I am glad that I was able to help.
I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
It will be my pleasure to help you again either further with this or any future questions you have
Kind regards
Stuart