Landlord moving into freehold bbuilding divided into 3 flats.

Tenancy Types and Management

My wife and I have just sold our principal home and are moving temporarily into one of our vacant investment properties.

The property we are moving into is in a large 3 story Victorian building which was converted into 3 large completely self contained flats around 1913. (one on each floor)

The building is freehold which we own with no mortgage. There are no chief rent or other charges on the property. All services, council tax etc are separate and the building could easily be sold off as separate units should we create the required leaseholds at some point in the future.

We currently let the ground and first floors on AST's to long standing tenants. Therefore we have allowed the agreements to become periodic.

We are moving into the top floor flat for an unknown period of time whilst we look for a suitable property to buy as our principal home once again. The top floor flat will become our principal home.

My question has several parts:

Do we need to issue new tenancy agreements and re issue deposit protection notices to reflect the fact that we are now occupying part of the building? (are we now resident Landlords?)

If we do then is there a simple clause we can insert into our existing AST template to achieve this?

Many thanks in anticipation of your help.