Limited company: tax savings and working from home

I found a helpful article discussing tax savings and working from home as applied to a business owner of a limited company, which talked about the limited company renting a room in the owner's house from the owner.  The rents are paid on a commercial basis at normal market rates under a rental agreement granting non-exclusive use of a room / rooms.

I know that the non-exclusive use bit means that there are no capital gains tax issues, and of course that the owner will have to pay income tax on the rent (after offsetting mortage interest, utilities, etc.), and on the face of it this sounds like a really good approach.

Is there anything I'm missing?  Could there be any unpleasant knock on impact on council tax / home insurance / ...??