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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