Sch 15 para 73
If a document provided for the purposes of making a TTH election contains an inaccuracy which is, or results in, an overstatement of the total TTH amount, Schedule 24 to FA 2007 has effect as if— (a) the seller (and not the purchaser) is treated as giving the document to Her Majesty's Revenue and Customs, (b) the inaccuracy is treated (so far as would not otherwise be the case) as leading to a false or inflated claim to repayment of tax, and (c) “the potential lost revenue” in respect of the inaccuracy is an amount equal to 10% of the amount by which the total TTH amount is overstated.