Just packed my BBA for the 1st time, and it's all a learning curve!
Not quite as straight forward as I'd been expecting.
Many thanks to Sungod for hints and tips.
Firstly, the rear wheel tyre touches the front wheel's spokes, near the hub. For me this is a 'Bad Thing'! Fully deflating the tyre helps, but with tubs I prefer not to, but hey......
Secondly, you have to be very sure that nothing in the lower case can reach up and touch the wheels. For me this meant putting the handlebars in a non-conventional position, and for peace of mind I removed the rear mech too. THe trouble is you just don't know for sure if anything is touching or not as you can't see inside when you close the lid. I don't like taking the rear mech off as it's a tight thread and always seems tough to remove.
But I'm reasonably happy with how it is now, and the box is very solid. Fingers crossed!