Fixed costs in rent possessions

In relation to fixed costs in possession claims, does the amount of the entitlement depend on the rent due when the claim is commenced or the rent due when the claim is heard in court?

The fixed costs are now the same, whatever the amount of the arrears and whether the arrears have gone up or down between commencement of the claim and the hearing of the claim. The fixed allowance for the hearing is set by CPR 45.4A (1) and is £57.25.