Transfer of Deposit From TDS to DPS but AST the Same

Hi Adrian, we have a landlord with a block of 7 flats we have been managing for several years, which they now want to self-manage as a cost-saving.

However, the deposits are currently in our Client account, protected with the TDS & we want to transfer them to the landlord's DPS account, but the landlord doesn't want new ASTs (all periodic).

We have served an S48 and will provide new DPS Prescribed info and send the funds off to the DPS.
Is that all we need to do, or have we missed something?

Many thanks in advance.