OK, we know a bit about that here too.
There is a general principal in English Law called Adverse Possession. A person who occupies another's land for more than 12 years, maintaining it as if he owned it, without permission, may then apply to claim the land. The popular press refer to the law as Squatters' Rights.
In 2002 the law was changed such that the above still applies to unregistered land (at the Land Registry). However if the land in question is registered, gaining Poseesionary title for the land is a lot more difficult.
So the answer to your question is 'maybe'.
Are you claiming land or had a plot you seem to have now lost to someone else?