Entitlement to an allowance in respect of weeks before that in which a claim is received by the Secretary of State
7. A person in respect of whom a certificate is in force may be entitled to mobility allowance for any week—
(a)falling before the week in which a claim for the allowance by or in respect of him is received by the Secretary of State; and
(b)falling after the date specified in the certificate in respect of him as being the date on which such certificate comes into force.