When you say trashing the place, do you mean physically damaging it or just neglecting it and being careless? If he is literally trashing the place, then it is criminal damage and becomes a police matter.
If the tenancy agreement has become periodic, then you serve a section 21.1. a notice. If you are doing during the fixed term, to expire at the end of the term, you serve a 21.1. b notice.
As the tenant is breaching the agreement, I would suggest that you also served a section 8 notice ground 12, breaching an obligation the tenancy other than one related to the payment of rent.
You also have ground 13, the tenant’s actions have caused the condition of the property to deteriorate.
If there is furniture in the property and that’s deteriorating, also ground 15.
The section 8 grounds are discretionary and hence, the more evidence you have, the better.
Section 21 notices are very often defective because the 2 month notice period needs to include at least two rental periods and if it’s one day out, will be rejected and you are back to square one which is why I suggest also serving a section 8 notice. For that reason, and unless you arecompletely au fait with the dates, you might want to give more than 2 months notice.
Here is a useful page on section 21 notices
and here are all the documents you will ever need
you are going to have to give in the Renting in England booklet and whether he gets wind of what’s happening or not, is actually not relevant. You are still entitled to recover the cost of any damage from the deposit and you are also entitled to recover any additional cost, not covered by the damage, from him personally, through the county court if necessary.
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