413. Amount of compensation for improvements not consisting of planning permission.

The amount of compensation payable to a tenant1 in respect of any tenant's improvement2 which does not consist of planning permission3 is an amount equal to the increase attributable to the improvement in the value of the holding4 at the termination of the tenancy as land comprised in a tenancy5. 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 provision of a tenant's improvement, the amount of compensation otherwise payable in respect of that improvement is reduced by the proportion which