New system is so complicated. Personally I would check with citizens information or rtb as if you go along as you plan and the tenant challenges it after 6 months you may have to refund and could have to pay them compensation. You just never know.
You could be wrong in setting rent when changing tenants.
Threshold shows
In RPZs, the rent can only be increased once every 12 months. This increase must be done in the form of a Rent Review giving tenants at least 90 days’ notice. A Rent Review must be served as a hard copy. The official Notice of Rent Review Form.