Chris J. asked:
Has Ken Follet ever acknowledged that he "borrowed" the main idea for The Pillars of the Earth (1989) from Edith Pargeter's The Heaven Tree Triology (1st novel published in 1960/61)? Pargeter is perhaps better known under her pen name Ellis Peters, as author of the Brother Cadfael novels.
Miriam Majome Interesting but from his foreword he did not and attributed his ideas solely to his love and intrigue with cathedral architecture and a book he read on the subject but certainly not the one you mentioned. He acknowledged a deceased architecture historian whom he later personally befriended but sorry I forgot his name. He never mentioned any other book such as you speak of but it is an interesting idea. Perhaps you could get hold of him via social networks as he is writing the third in the series set to be released 2017 as I read somewhere