Ray Mears had published his first book before making any BBC series.
With regard to "gratitude": The BBC is an organisation, not a person and did not make the Ray Mears' documentaries out of altruistic reason towards Ray Mears. Ray founded "Woodlore" when he was 19 years old. So it would seem that hte BBC chose him because he was an established "Survivalist". They needed him at least as much as he needed them.
The BBC owns the documentaries in which he appears. They, thus, have the last word on their content. Thus it is quite reasonable that Ray could get annoyed about various aspects of the finished product- especially if he gets blamed for it afterwards.
Thus I got annoyed with the photography in "Northern Wilderness". Far too glossy, repeated aerial shots as you see in "Coast". Exagerrated political correctness, etc, etc. All these faults I blame on the BBC, not on Ray.
I look forward to seeing some documentaries made and owned by him (or Woodlore). Has anyone read the copyright at the end of the credits for the ITV production? Who owns it?