Gorgeous George! He's so cute :D If you get another get on sooner rather than later as they're territorial and can take a wee while to learn to "share".
Are you letting him outdoors and have you had his balls off?
We have an excellent cattery where ours go on holiday to a heated chalet with outdoor space, runs etc. They have bunnies and pigs come into visit in a central courtyard to keep the entertainment ongoing too
They even have a webcam so you can check in on them. It's worth finding a place you're happy with if you intend to do that when you're away travelling. Long weekends etc they're fine at home and can be "cat-sit" but longer than a week we send them on hols too.