Evidence for section 8 ground 14

When serving a section 8 notice with ground 14, do I need to include EVIDENCE to the tenant of the anti-social behaviour, or just an explanation? (I am not planning to start court proceedings after this notice, but I also intend to serve a section 21 notice.)

Also, the section 8 wizard says I need at least 18 days between the service and expiry dates, but I understood that no notice was required for ground 14.

Thanks

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Landlord Wants Tenant to Leave

A tenancy of someone's home, starting on or after 28 February 1997, will in most cases be an assured shorthold tenancy. Take advice early if there are any doubts about what type of tenancy is being terminated. The procedures for ending a tenancy are different, depending on the type of tenancy.