Hi I have a tenant introduced by the council who signed an AST 03/10/11 for 3 years with no clause for early termination. Unfortunately she has been a nightmare with complaints/petitions (letters kept as evidence) from 10-15 residents about visitors behaviour, noise levels, rubbish outside of the property, smoking from inside the flat which invalidates my buildings insurance,possible drugs etc. The T asked if she could end her AST and leave which I was happy to do and we both signed a Declaration of Surrender and she agreed that 01/07/2012 was fine and gave her 6 weeks to find a new property alternatively she could back to her dads if all else failed. She has not found anywhere else and now says that she wants another 2 weeks (apparantly going home to dad is no longer an option).I have reluctantly given her an extension until 13/07/2012 as I have new tenants signed up to move in on 14/07/2012 .We have signed a new declaration but I want to issue a Section 8 notice asap.She has broken several conditions of the tenancy agreement - so would I use Grounds 12 or should I also include Ground 14 because the residents were intimidated by the tenants friends when they hanging about outside of the flat.Also can I use the Declaration of Surrender under any of the grounds as she asked to leave and should really go. Basically I need to make this Section 8 notice as strong as possible so that if I do have to go court then the judge will have no option but to issue a Notice of Possession - I'm now in a situation where I will probably have to let the new tenants go because the T is so erratic and keeps changing her mind about going.