Extension of periods
12.—(1) An employer and an employee may agree to an extension of any of the periods referred to in regulations 3, 4, 6, 8, 9 and 13.
(2) An agreement under paragraph (1) must be recorded in writing by the employer.
(3) The employer’s record referred to in paragraph (2) must—
(a)specify what period the extension relates to,
(b)specify the date on which the extension is to end,
(c)be dated, and
(d)be sent to the employee.