Yes, Neil and Christine Hamilton did likewise and won their case. On the other hand, if your husband and someone else from the company argue that, and they know it's untrue, and are later caught in the lie, they would almost certainly serve a custodial sentence for perjury.
It's likely he'll get no more than six points and a fine of a few hundred pounds. I'd take that! If he already has six or even nine points for previous speeding offences then he'll be banned after the 'totting-up'. If that's the case though he can hardly complain.