‘“official error” means an error relating to a tax credit made by— (a) an officer of the Board, (b) an officer of the Department for Work and Pensions, (c) an officer of the Department for Social Development in Northern Ireland, or (d) a person providing services to the Board or to an authority mentioned in paragraph (b) or (c) of this definition, in connection with a tax credit or credits, to which the claimant, or any of the claimants, or any person acting for him, or any of them, did not materially contribute, excluding any error of law which is shown to have been an error by virtue of a subsequent decision by a Social Security Commissioner or by a court;’
‘(1) A decision under section 14(1), 15(1), 16(1), 18(1), (5), (6) or (9), 19(3) or 20(1) or (4) may be revised in favour of the person or persons to whom it relates if it is incorrect by reason of official error, subject to the following paragraphs. (2) In revising a decision, the officer or person in question need not consider any issue that is not raised by the application for revision by the claimant or claimants or, as the case may be, did not cause him to act on his own initiative. (3) A decision mentioned in paragraph (1) may be revised at any time not later than five years after the date of the decision.’
“This checklist is for you to use to help make sure that the information on your award notice about your personal circumstances is correct and complete… If anything is wrong, missing or incomplete you must tell us within one 1 month of receiving your award notice or you could be asked to repay an overpayment.”
“Contact us now if you have answered NO to any of the above questions.”
“If any of the details at Steps A and B are wrong…put an “X” at box 3.2 at Part 3 of your TC603D2 Tax Credits Declaration and phone us now.”