Where any of the liabilities of a successor company are extinguished by virtue of section 106(1) of the M1Railways Act 1993, section 400 of the Taxes Act 1988 (reduction of allowable losses on write-off of government investment) shall not have effect in relation to any amount of government investment in a body corporate which, apart from this paragraph, would thereby fall to be regarded as written-off for the purposes of that section.