Budget changes to Rent a chair - separate trade for turnover purposes?

So following the budget confirmation that rent a chair income is a supply of services and therefore counts along with hairdressing turnover towards the registration threshold, I have a lot of panicked clients ringing me up.

It occurred to me that if an individual rents a shop and supplies facilities to a sub-lessee under rent a chair, if this was done as a sole-trade for example, and the hairdressing business was incorporated, do we not have two separate legal entities providing two different trades, therefore not subject to aggregation rules?

Thanks for any opinion.