I have a 2011 Octavia Scout with a Bolero system fitted as standard.  What info/ent system will fit the scout to give Nav etc.

Columbus (and its VAG equivalent) was the Nav upgrade to the Bolero, but you would need a new fascia to install it. There are numerous threads in the Octavia MKII section on how to do this, as well as other systems people have installed. 

 

Just a quick search brought this one up;

 

Not suggesting this is your only aftermarket option, but gives an insight to what it involves any issues you may come across. 

 

Both Kenwood and Pioneer do VAG specific ICE.