This Q&A considers how to determine whether an employee is 'assigned to the organised grouping of resources or employees that is subject to the relevant transfer' for the purposes of the Transfer of Undertakings (Protection of Employment) Regulations 2006 (TUPE 2006), in particular, when looking at the percentage of time spent working at the part of the business that is transferring, where an employee is employed by a holding company but in practice works for various group companies and the nature of the employment is such that the time the employee spends working for each group company fluctuates on an ad hoc basis, how a tribunal will assess the percentage of time spent working in the transferring business.