The following page and word count for the prose books ought to prove how much work went into each:
Some Things Strange & Sinister 330pp 92,979 words
Some More Things Strange & Sinister 322pp 96,931 words
Pursuing The Strange & Weird 240pp 66, 911 words
The Bizarre Legend & Crimes of Spring Heeled Jack 54pp 19,138 words
Red Paper:Canids 202pp 67,261 words
The Girt Dog of Ennerdale 42pp 13,527 words
Strange & Mysterious Beasts 324 pp 70,539 words
UFO Contacts:Looking At The Evidence 530pp 171,972 words
Unidentified –Identified 220pp 73,671 words
Contact! Encounters with Extra Terrestrial Entities? 370pp 140,865 words
The Hooper Interviews 365pp 78,672 words
Total Word Count: 824,555
Of course that does not include the hundreds of images -some very rare of thought to have been lost 100-120 years ago, illustrations and countless reference and everything is factual -no lies or twisting facts to sell the book like most authors dealing with "World Mysteries"