Exception No 4 (page 6 of the link in the last post)
6.4.1 In the past PPL holders have queried whether they are entitled to recover from their employers the costs of running their own aircraft or hiring an aircraft to fly themselves on business, e.g. to a business meeting. As they have reasonably argued, they would be entitled to travel by train or car and recover their expenses of so travelling and wish instead to recover some or all of the costs of flying. Insofar as the employer has an interest in the employee travelling to a particular location at a particular time, then any payment made by the employer (even a contribution to costs) in relation to the flight will be in respect of the flight or the purpose of the flight. Thus the flight would be for the purpose of aerial work and outside the privileges of a PPL. However, an exception has been established permitting a PPL holder to recover the direct costs (but not the annual costs) in such a situation the flight being private for all purposes.
6.4.2 There is a proviso ensuring that on such a flight no one is carried who is under any legal or contractual obligation to be carried, e.g. the boss cannot order members of staff to travel with a PPL holder but must permit the option of an alternative means of travel.
If you're renting the helicopter then the direct cost is the rental cost.
If it's your helicopter then you'll have to look up the meaning of direct costs.