The basis was to save money e.g. on fuel, yet I have spoken with the fuel supplier, we use at our home base, who told me that the only difference would be that we wouldn't pay VAT, but we get the VAT back already as it is anyway, being a VAT registered company (non-aviation).
The owner will probably not be willing to charter the aircraft out for others since he needs it to be available for him on short notice.
Jess