414. Amount of compensation for improvements consisting of planning permission.

The amount of compensation payable to the tenant1 in respect of a tenant's improvement2 which consists of planning permission3 is an amount equal to the increase attributable to the fact that the relevant development4 is authorised by the planning permission in the value of the holding5 at the termination of the tenancy as land comprised in a tenancy6.

Where the landlord and the tenant have entered into an agreement in writing whereby any benefit is given or allowed to the tenant in consideration of the obtaining of planning permission by the tenant, the amount of compensation otherwise payable in respect