Notice to Leave

Tenancy Types and Management

One of our tenants (housed under NRLA Deposit Guard Tenancy Agreement May 2019 Edition) has - over a period of many months - successively given us notice to leave (with a specified move-out date but never with the full one month's notice that Agreement specifies) and then withdrawn it.

The latest two cycles - as evidenced from our WhatsApp logs - is as follows:

03/03/21 Notifies that she will move out on 26/03
04/03/21 Withdraws previous notice to leave
10/03/21 Notifies that she will move out on 27/03 "for real this time"
15/03/21 Reiterates that she will move out on 27/03 but apparently believing that her notice on 03/03 is still valid

Our assumption is that we would be entitled to take her notice to leave as 10/03 (and not 03/03) and that we would be entitled to deduct sufficient monies from her deposit to give us one full month's paid rent to 09/04 (ie including the period 28/03 to 09/04 in lieu of notice).

Our assumption is that even had a full month's notice been given, an actual move-out day should be ON or BFORE the expiry of any notice to leave (in the above case 27/03), for the tenant to avoid incurring an extra day's liability to rent.

Are these assumptions correct?

Forum advice most welcome.