Advice on Assured Short Hold Tenancy agreement

Letting Agents

Hello,

We are leaseholders of an apartment which we are planning to sublet. Our property is rather unique in that the Freeholder of the apartment block pays the electricity bill and a company called 'Ginger Energy' collects payment of the individual apartments.

You can read the set up here (OneDrive link) where there is a document for the tenant and the leaseholder. https://1drv.ms/u/s!An9knWea15wgsA02igaFOzzkY-zL?e=NyZ2WO

As you can read if the subtenant defaults the bill gets redirected to the leaseholders (Us).

My Question is do we need to add anything to the shorthold tenancy agreement to highlight this and to allow us to hold on to the subtenants deposit until they pay their final electricity bill at the end of the tenancy?

We plan to use OpenRent to market and create a tenancy agreement?

Many thanks

James and Kathryn.