31. Where—
(a)a pensionable officer after suffering loss of employment or diminution of emoluments enters any employment referred to in regulation 22 or becomes entitled to any superannuation benefit on ceasing to hold such an employment,
(b)a person entitled to long-term compensation, whilst that compensation is liable to review in accordance with the provisions of regulation 32, enters any employment, or ceases to hold an employment, or receives any increase in his emoluments in an employment,
(c)a person entitled to retirement compensation enters employment in which the compensation is subject to reduction or suspension under regulation 30 or ceases to hold such an employment, or
(d)a person entitled to long-term compensation starts to receive any benefit, any increase in benefit or any further benefit, under any enactment relating to National Insurance,
he shall forthwith in writing inform the compensating authority of that fact.