I had stereotactic radiotherapy following decompression and fixation surgery to a single bone met at L2 which fractured and caused spinal cord compression in August 2019 at the Royal Marsden Hospital in London. It was not a trial as far as I know. The team at the hospital where I had my spinal surgery referred me and it went ahead without any problem. Good luck with it x
Jane, I had SABR for oligomet in soft tissue (not bones) at the Royal Surrey in Guildford in 2020. It was part of a commissioning study that I think they were leading, which was very successful & SABR is being rolled out.
It might be worth a call to them to ask if there are other places doing bones. The consultant was femal with a surname beginning with E, in the Radiology team.