Problem tenant "sell and rent back"

Tenancy Types and Management

I can sympathise with you here but if i was in your position i would take as a last resort the eviction path, simply because i had bought the vendors house at "well below market value" i would feel a degree of responsibility towards them.
I would have set up a standing order mandate when signing tenancy agreements if you havnt already done this.Whilst reminding them that you run a buisiness and the debilitating effects of an eviction followed by a ccj and the problems they will have renting and credit in the future!!
You maybe need to contact them face to face to sort this out and find out why they havnt paid and what they are thinking of doing about it!!

Hope this helps mate