7. For regulation 50 substitute—
“50.—(1) If—
(a)a person (“the contributor”)—
(i)was entitled to pay a Class 3 contribution under regulation 48, 146(2)(b) or 147; and
(ii)failed to pay that contribution in the appropriate period specified for its payment; and
(b)the condition in paragraph (2) is satisfied,
the contributor may pay the contribution within such further period as an officer of the Board may direct.
(2) The condition is that an officer of the Board is satisfied that—
(a)the failure to pay is attributable to the contributor’s ignorance or error; and
(b)that ignorance or error was not the result of the contributor’s failure to exercise due care and diligence.”.