Section 22

Where the tenant of any premises to which this Act applies has sublet any part of those premises then the tenant or any sub-tenant of that or of any other part of the premises may at any time apply to the Board to apportion the rent of the whole premises as between the tenant and all the sub-tenants of any part or parts of the whole premises and to determine the rent of all or any one or more part or parts of the whole premises sublet to any and every subtenant thereof and the Board shall thereupon make such an apportionment and determination:Provided that the total of the rents payable to the tenant by all the sub-tenants shall not in the aggregate exceed 110% of the rent of the whole premises after making an apportioned reduction in respect of any part of the premises retained by the tenant or not sublet by him.

When any application is made to the Board under this section all sub-tenants of the tenant shall be deemed to be interested parties in the proceedings and shall be given an opportunity of being heard and of producing such evidence, oral or documentary, as appears relevant to the Board, and may, if the Board so directs, be joined as parties in the proceedings.