Posted By DRB
The regs only apply to parts of a private dwelling used solely for work purposes if its used by more than one person who does not live there or members of the public attend to deliver or receive goods or services.

It's unlikely that any of your employees will fall within the this scope therefore I would let it lay. Even if you do have employees who do come within this scope I would still be inclined to leave well alone. You'll do more harm to your credibility if you try and get people to display signs in their own home and in any case who is going to enforce this part of the regs? No one I suspect.