Passport.
departure card (TM.6) (if any) Example.
Previous notifications of staying over 90 days (If the applicant has been notified before) Example.
Completely filled in the notification form (TM.47) and signed by the applicant (not another person) Example.
Ignore the TM6.(suspended for airports)
My most recent at CW they just wanted last TM47 receipt and new filled in form.
Had my lease etc, however was not looked at or required.