The unit, scrutinising the affairs of 5,800 people with assets of £20m or more, increased its yield from tax enquiries by 10%, having collected £200m in 2011/12. Established in 2009, the unit has generated a total of £665m in additional tax over the last four years, in addition to the tax HMRC normally collects from the group. The unit employs 380 staff across sites in Birmingham, Bradford, Cardiff, East Kilbride, Edinburgh, Portsmouth, Washington and Wrexham. Exchequer secretary to the Treasury, David Gauke, said: "HMRC's high net worth unit provides the specialist attention they require in ensuring the wealthy pay the tax they owe. This government has reinvested almost £1bn in HMRC and expects them to deliver almost £22bn in 2014/15. Head of the unit Martin Randall said: "The tax affairs of the richest people in the country can be...