The step referred to was taken by the contractors following on a recent intimation from the National Board of Conciliation for the Building Trades that the Building Workers' Industrial Union was not a union recognised by that body. The Air Ministry is in consultation with the Ministry of Labour in regard to the possibility of further action being taken under the Conciliation Act, 1896. I am not aware of any such cases of reinstatement of men under notice to leave as are referred to in the second part of the question. I would add that the contract is now approaching completion, and that as a consequence large numbers of men are necessarily being discharged.