Do you know any good non-fictional books about Boudica?
I really enjoyed Boudica: The Life and Legends of Britain’s Warrior Queen by Vanessa Collingridge while doing my research and actually drew quite a bit of stuff about her legacy from it (hint: you can read large chunks via google books if you want a taster).
Also, if you want the context of Iron Age Britain (and I believe there’s a bit on Boudica in there) I also highly highly recommend A History of Ancient Britain by Neil Oliver. That book is my everything; I have been on many rambles following in his footsteps (oh god, the Ridgeway walks, particularly near Oxford, and the S. Dorset Ridgeway are possibly the most magical places on earth. Lexa will definitely take Clarke to the Uffington White Horse and along the ancient chalk ridgeway to the longbarrow). I think there’s even a tv series that goes along with it. And Neil Oliver has such a lovely soothing Scottish accent..