I'm not quite as bowled over by Julia as everyone else seems to be. I like many of the programs because of the photography but she just doesn't come across to me as a "real" walker"! I sometimes wonder whether she does the complete walk at all, or just short stretches for the film crew!
To answer your curiosity...
I was doing the C2C at the time she made the doco.
I passed by her and her crew on a few occasions only to find they had 'leapfrogged' ahead of me in their vehicle to film at a further location.
Still, nice that they've made a documentary on the C2C, I'm hoping it will eventually surface down here in NZ.