Hi Daniel, thanks for your question. My name is***** can assist with this.
In essence, the basic requirements to show adverse possession are: that you have possession of a piece of land from which you have excluded the real owners. Also, you would need to show that you have possessed it for a continuous period of 12 years.
However, after 10 years of possession, you now need to make an application to the land registry first. This gives the paper owner an opportunity to resist the claim. The law has been tightened up to reduce the number of adverse possession claims.
You can get a detailed breakdown of the requirements here, at the land registry: http://www.landregistry.gov.uk/professional/guides/practice-guide-4
There is an application fee to be paid to the Land Registry of £130.
Obviously, if solicitors are involved, the costs will be higher, but you do not always have to use a solicitor.