“ 147(1) …a person…may …if he so wishes and if he satisfies conditions specified in paragraph (3) below pay contributions in respect of periods during which he is outside the United Kingdom as follows….”
“ 148. Entitlement to pay Class 2 or Class 3 contributions under regulations 146 or 147 shall be subject to the following conditions – (a) that the payment is made within the period specified in regulation 48(3)(b)(i) and…..”
“ 48(3) (b)(i) where the contribution is payable in respect of any year before6 April 1982 , before the second year following the year in respect of which it is paid; and where the contribution is payable in respect of any year after5 April 1982 , before the end of the sixth year following the year in respect of which it is paid….”
“(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.”