Level of Proof Required for Section 8 Eviction

Possession - Section 8 and Section 21

Dear Forum.

I am preparing a S8 eviction notice within the terms of a standard NRLA assured shorthold tenancy agreement (2020 Version 1.1m.

My proposed grounds are as follows:

S8 Ground 12
Breach of tenancy terms as follows:

1. 13 Anti-social behaviour generally
2. 13.1 Excessive noise
3. 13.2 Failure to control pets
4. 13.3 Visitors loud and disruptive
5. 13.6 Failure to manage rubbish and recycling
6. 13.7 Failure to prevent any other person (visitor) causing annoyance
7. 13.8 Harassment of neighbours

S8 Ground 13
Neglect or damage of the property
S8 Ground 14
Nuisance to neighbours
S8 Ground 17
False information provided by tenants in support their original tenancy application

S8 Ground ?? (I can't see any ground listed for this)
I wish to sell the property

I would be grateful for ANY advice on the level of proof required to secure a court order under the above grounds, given that many (if not all) the neighbours who have complained are unwilling to provide formal witness statements or be identified in any way. (The property is in Manchester).

Also there are outstanding repairs to the property (some due to the tenants' behaviour, some not) due to my inability to recruit tradesmen to do the necessary work, due to the chronic overcrowding within the house, a rear yard full of rubbish and human/ canine faeces, and the general state of the place. Will this jeopardise my chances of court success?

Thank you for your assistance.