What rights do sub-tenants have?

Hello,

I would like to know what rights sub-tenants have?

I am interested in renting a room from a tenant who has rented the whole property from the landlord. I would be paying rent to the tenant. They would also be living in the property, we would share the bathroom/kitchen/lounge. The room I am interested in has a lock on the door.

The tenant has permission from the landlord to sublet.

I would like to know what sort of tenancy agreement I would be entitled to. Would the tenant be entitled to ask for a deposit from me and could the deposit be safeguarded in a deposit scheme?