"Where an employee claims that his employer is liable to pay him an employer's payment and either - (a) that the employee has taken all reasonable steps (other than legal proceedings) to recover the payment from the employer and that the employer has refused or failed to pay it, or has paid part of it and has refused or failed to pay the balance, or (b) that the employer is insolvent and that the whole or part of the payment remains unpaid,
"If on an application made to him in writing by an employee the Secretary of State is satisfied - (a) that the employer of that employee has become insolvent; and