Well, DS only lives round the corner now, so it's not like previous years.
In the past we've always persuaded one of the DC to come and cat sit when we go away.
We thought this year that DS could just pop in twice a day and sort them out, but as Mr G refuses to come in via the window, I think DS will have to stay overnight at least.
He can go back to his own place during the day once he's dealt with the litter trays