DH is self-employed and has been for over 20 years. He's got several clients and his own vehicle.
As part of the work he does for one firm, he will often drive their van for doing their deliveries for them etc as it is bigger than his. He only uses it during the hours he's there, and not at any other time, nor does he drive it to and from work. He also uses his own vehicle when working for them too.
It's a very ad-hoc arrangement, and he works variable hours a week there which are agreed day to day, and it isn't his main source of earnings. He invoices the client for his time.
This business owner (v small Ltd Co) has got in a mess with their accounts, and as part of a consultation with a local accountant, the accountant said that since DH drives the firm's van, then that means that he must be treated as an employee of the company.
I disagree and don't think he is an employee, and I'd like to pick your collective brains please 