11. Where in relation to statutory sick pay a period of entitlement as between an employer and an employee is running at 6th April 1988 and the employee’s normal weekly earnings under the contract of service with that employer are not less than, or treated for the purpose of section 7(1) of the Social Security and Housing Benefits Act 1982 as not less than £76.50, they shall be treated as not less than £79.50 for the remainder of that period.