I am a bit clueless when it comes to disc brakes as I have never had a bike with them on. I see a lot of people change the Tektro brakes for Avid ones so I assume on the Boardman CX Comp you can change the Tektro callipers for Avid BB7 callipers but do you need to change the disc as well or just the calliper and why are the different size discs available.
If it was my choice I'd change the rotors ,the pads were designed with a set of rotors in mind. Id prob change mine to bb7. The tektro are a pain to adjust and doesn't seem to have any 'bite'.
Pedals fitted, she's ready to go..