Hi Jamie,
Sorry, I can't comment on the Pat Chapman book but I have both The Curry Secret & The New Curry Secret by Khris Dhillon. They are a good read, and you may pick up something from them. The New Curry Secret lends itself to more traditional recipes but cooked in a BIR way.
You can get them pretty cheap also, so I think they may be worth while but, there are far better recipes on this forum in my opinion.
Also, you may want to try using this link
https://curry-recipes.co.uk/curry/index.php?board=5.0 There are loads of e-books here, all free. I think the Bruce Edwards one is in there, that you may hear mentioned from time to time.
Hope this helps mate?
Ray
