Simon I cannot help but clap for this one ... I am a huge Harryhausen fan and I actually met Ray and had the opportunity to chat with him.... incredibly candid and just a full of life person.
Here is one of my articles regarding a film he was originally supposed to work on and Hammer really wanted Ray for it. But he was involved with another production, so the project went to Jim Danforth. However it has become one of my favorite stop motion films outside of Rays work....
https://medium.com/@docdrwho/when-dinosaurs-ruled-the-earth-a-cryptid-adventure-or-warner-archive-goes-back-in-time-way-back-cf171de38927