> it is illegal for a rental deposit to not be put straight into a deposit scheme.
Well, if by *straight*, you mean [*THIRTY working days* from the start date of the tenancy](https://www.mygov.scot/tenancy-deposits-landlords#:~:text=Tenancy%20deposit%20schemes,Letting%20Protection%20Service%20Scotland), you're right. So by mid October would be fine in this case.