There really is no problem using your aeroplane for business purposes. You can use it much like a car and claim the costs of doing so provided they do not exceed the direct costs as defined in Article 130 (9).
You may carry passengers so long as no payment is made for their carriage and it is understood that no person is obliged to travel by air if they do not wish to. Cost sharing as defined in Article 130 is permitted.
Many companies have a company aeroplane where all the flights are private.
The CAA is only concerned with the benevolent pilots who out of the goodness of their hearts and their dedication to horse racing, transport people from one race course to another without any charge being made! or so they claim.