Setanta insurance offer driving of other commercial vehicles
[broken link removed]
It's fairly new and through brokers only. They cover the main driver to drive other commercial vehicles, third party only once they do not belong to your employer, family or spouse (family include brothers, sisters, parents etc)
So in the OPs case(if this is the company he is referring to) he would be able to drive other commercial vehicles if the policy was in his name though not if it is in the company name.
I have not heard of any other company offering DOV on commercial motor policies.
No idea about Revenue though!