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The reason that I had not sought legal advise Lewpaper was from after doing hours of research on the internet it was pretty clear that as they are not my tenants, there is nothing I can do. From previous experience of the answerbank, I hoped someone would know of a loophole.
However, yesterday morning i got some legal advise which was, I can't do a thing. The council can force the landlady to evict but thats about it.
I have since heard back from the community safety officer and been visited by the police who have informed me that the tenants and the landlady have been warned and are aware that if continues, can result in being locked up and eviction.