Thanks for your reply.
As the Property is registered at the Land Registry, the magic number of years you need to have possessed the Property is 10.
In order to be successful, and obtain possessory title, you will need to show that you have possessed the property for 10 years continously without dispute or hindrance from the true owner. The fact that he may have turned up now won't affect any application you make as you have already "earned your 10 years" by the sounds of it.
The Land Registry will also require evidence of your possession- eg utilty bills for the 10 year period.
As the property is registered, the Land Registry have a set procedure as regards XXXXX XXXXX true owner- they will write to him at the address they have for him or the address he has provided them with (he is not likely to have informed them of any other address I woudn't have thought). If the Land Registry do not get any response from the paper owner, then your application then proceeds and they look at the circumstances of your case to see if possessory title should be granted. Even if the Land Registry do end contacting the paper owner, he would have to show that you have NOT possessed the property for 10 years, or he gave you permission to occupy, for your application not to be successful.
I therefore suggest that you contact a local Solicitor on Monday to get the ball rolling!
I hope this answers your question, and if so, I would be grateful if you could leave positive feedback.