Rent reviews and rating assessments
Rent reviews are a mechanism for adjusting a tenant's rent to the current market level. Similarly, the revaluation of rating assessments adjusts the rates an occupier pays, bringing it into line with rental values.
You negotiate rent reviews (if your lease provides for them) with your landlord. You discuss rates with your local Valuation Office. The key questions are whether an increase is reasonable and if you should challenge it.