In order to qualify as a deduction for tax purposes we have to demonstrate that the expenditure was incurred “wholly and exclusively” for the purposes of our business or employment. We will also need to consider a further criterion: where the expenditure has a duality of purpose. In a 1980’s case, a barrister claimed for the cost of business suits which she insisted were only used for business purposes. To her delight, the lower courts agreed, but HMRC were having none of it and pursued their case to the House of Lords where the taxpayer’s claim and appeal was dismissed. [...]