I didn't agree with your reasoning over rent reviews because it too high. Yes you probably went to arbitration via a court I have no doubt about or argument with that, but that was because, in your own reply, the landlord broke the terms of your lease, the arbitration stopped an unjust rent demand, they cannot reduce what you agreed to pay in a signed and witnessed lease.
The only time it would go to arbitration would be if your lease had an upward rental increase clause in it mid term, usually every 3 or 5 years on long term leases, if at this time the parties cannot agree the amount of the increase it would go to arbitration to stop what happened to you, this is not happening at the DW.
As for leases the council lease is about ground rent and terms and rules for the use of the property standing on the ground, they have no say whatsoever in what agreement has been made between two commercial companies on how much rent one pays the other.
Lastly the existing lease remains in place whoever is the lease holder, if the lessor (WAFC) sells the business or as in our case goes into administration the lessee (WRFC) still has protection of the terms of the existing lease, the new company cannot suddenly decide to increase the rent to force them out, we can only increase rent if there is a rent review pending.