The rules...

clearly state that if you vacate your seat for even a second in this house, it's considered free.
As proved by Barney when I only nipped through to the kitchen for a top-up of my beer!
And no, he can't read - he's only kidding on that he's busy and can't be moved :-)
Last night before J and the boys return home tomorrow afternoon.
So, that means we've got some housework to do in the morning Barney :-)