Regulation 12 Date as from which revised decisions take effect
If the Board decide that—
(a)
on a revision under section 9, the date as from which the decision under section 8 or 10 took effect was erroneous; or
(b)
on a revision under Article 10, the date as from which the decision under Article 9 or 11 took effect was erroneous,
the revision shall take effect as from the date from which the decision would have taken effect had the error not been made.