Such sad news, my thoughts are with his family.
I met Keith on a couple of occasions, once at his old workshop and latterly at his new place/home. I had a huge respect for his knowledge and skills, he allowed me to have a good nose around his machinery/workshop when I dropped my Monty engine off for rebuild and same again when I collected it. I remember laughing as he took a phone call from the owner of a Zane produced model, he couldn't hide his disgust and made it clear it wouldn't be welcome in his workshop, he was quite critical of the twins, definitely a triple man, a great character. RIP Keith.