Gorgeous. We got Frisbee on 17th December so my kids used their advent calendar for the puppy countdown. I'm sure Joe will be happy for you to visit again before you collect Bertie so that will break up the wait a bit x
You might want to use these 5 weeks to do 'all day' special outings with your family that you might find tricky once Bertie is home. A trip into London, the zoo or a theme park maybe. It might help to pass the time and once Bertie is home you won't be able to leave him for a whole day so will find those sorts of trips more difficult.