Does he pay rent? When does he pay this? Is it on a fixed day each month?
I assume therefore that it was not agreed that he would occupy the property for a fixed term?
If you have not charged rent on his occupation then it will be either a contractual tenancy or a licence to occupy. This means that you should provide him with "reasonable" written notice.
Generally, this is taken to be one month's notice. However in view of the length of time he has occupied the property I would be safe and give him two months written notice. The notice does not have to complicated, just refer to him, you the property his occupation (without rent or written agreement) and state that the document is a notice for possession and that you are giving him two months notice from date x. Send the notice by registered post and allow three working days for postage.
If he does not leave after this notice has expired then you will have to apply to the Court for an order for possession. If he does not leave after this time then you will have to apply for a warrant for execution so that the Court bailiffs effect his eviction.
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