Julian must have bought ''Undercover Curry'' too 
similarities?
If you mean any padding of the book out by simply replicating all the chicken dishes by replacing the word 'chicken' with the word 'lamb', then no, Haldi

(I still enjoyed Dave Lloyden's book, though I thought it overpriced for the amount of content.)
Julian seems like an honest guy, and there are several places where he acknowledges Dave Lloyden as the inspiration behind him starting to do curry nights at local pubs before starting his takeaway business, but in terms of everything else it reflects his own experience as a curry chef who's learnt the hard way.
I like the way he's woven the narrative of his curry journey throughout the chapters, which gives the book that personal touch and makes for more interesting reading than just focusing on ingredients/recipes.
And to back it up with all those videos seals the deal for me.
As has been said, a tremendous amount of work and thought has gone into it, and while there are other excellent books out there, this is without question the most detailed and comprehensive book I've bought on the subject.
Well done, Julian - looking forward to the next two!