@Ste pt1
Managed to try a 53cm Attain Race today - not the exact model in the range that I want but I just wanted to check out the sizing and I have to say it felt pretty much spot on and virtually the same as my current bike.
I'm 5' 8.5" and the 56cm felt like a big bike to me although Cubes are supposed to come up small?
The Race was a 2016 model so they are starting to hit the shops.