In reply to tom s:
https://coachmargarita.co.uk/
Is someone who has had a lot of success with a good mix of endurance running and strength and conditioning. She coached Jim Mann through (all?) his successes through the mid part of the 2010's, she is strength and conditioning coach to Andy Berry, and she has coached my wife who has developed a good endurance running CV, https://www.runlikeahaggis.com/about-me/
Edit: I forgot to mention https://www.andyberrycoaching.org/ he can run a long way quickly can, Andy Berry 78 peaks in 24 hours I understand, he's had success with coaching for Steve Parr Round recently.
Post edited at 20:32