Eviction Notice Review and Tenant Dispute

I'm a landlord in the East Midlands with a problematic tenant who has stopped paying rent for three months and is refusing to engage. I've got a section 8 notice prepared but I'm concerned about whether it's been served correctly and whether I have all the grounds documented properly. The property is an assured shorthold tenancy, and I want to make sure I follow the correct legal procedure before progressing to court. Additionally, there's a dispute about damage claims and deposit deductions from a previous tenant that may complicate things. What I'm looking for: A review of my section 8 notice, advice on service and next steps, and guidance on how to handle the competing claims fairly.