You'll just need any of the usual stuff you've needed for PPL flying as far as i can see. Bristol include an airway manual so don't worry about that.
You'll need a CRP-5 (rather than the crap-1) and plotter, protractor etc. One extra thing i needed was a pair of compasses (though actually i cheated and used a bit of string for that bit).
I'm coming to the end of module 1 now and have actually found it quite enjoyable. Not looking forward to the 3 weeks of revision/exam hell that looms at the end of October though!