Are they in the house in which you live or a separate accommodation?
Ok. What type of contract is this?
Is it entitled assured shorthold tenancy agreement?
So is it entitled AST?
Thanks. That is almost certainly void but that just means that they are on a periodic tenancy agreement.
To bring that to an end you need to serve a S21 notice giving them no less than two months notice on or before the rent date.
You should also serve a S8 notice for completion citing non payment of rent. It isn't an AST so it doesn't really matter. This is just an abundance of caution.
If they still don't go then you would have to seek a possession order at court but it would be guaranteed to you as this is a periodic and you can end it at any time with a S21 notice.
Can I clarify anything for you?
That is nonsense.
You just service notice, let it expire and then seek possession.
Then they think it is an AST and you said above it was not.
If it is an AST then you can serve a S21 notice at any time but you cannot bring the agreement to an end before September 2016.
You could serve a S8 notice but to be guaranteed possession you would need to wait until they are two months in arrears.
You do have a right to 'reasonable access' which does include the right to inspect.
You do have to give tenant's notice though and give them the option to choose other dates.
You can send them texts.
As long as you only send a reasonable number of texts and there is a legitimate reason for them then that is not harassment
All the best.