You could try buying a cheap contour gauge to allow you to draw the profile/size and then contact a plaster specialist like these guys? - https://www.fineartplasterwork.com/
Gauge on the way - thanks for this. Also that website - you know when their first photo is of a royal palace they might be out of my price range.
Yeah, but they are based in Norbury, next to a used car place and opposite a Lidl...
@bazschmaz started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
You could try buying a cheap contour gauge to allow you to draw the profile/size and then contact a plaster specialist like these guys? - https://www.fineartplasterwork.com/