AFAICT this appears to be a potential scale subject that has never been addressed. Blue Water development was started in the late '50s as a European replacement for the unwieldy Corporal tactical missile. Unfortunately, it was canceled in favor of the U.S. Sergeant, even though the Sergeant was 3x more expensive and shorter range. I've found no dimensions for Blue Water, other than the following: Diameter: 0.61 m Span: 2.06 m Length: 7.6 m Pretty slim, but the photo above is nearly orthogonal, and in addition, we have the wheelbase of the Bedford 4x4 truck in the above photo at 3.962 m. From that and a few other photos, I've scaled the above OpenSCAD model. It still needs some more details, and I expect to go through everything again to double-check, but I will provide the scaled dimensions soon. The missile shown in the video and above photo is almost certainly a training mock-up, as in other pictures it doesn't appear to have a nozzle. However, the configuration does appear to conform closely to the photos of the missile in flight. In color photos, the mock-up appears to be dark olive green, with no markings at all. All the flight photos I've seen are B&W, with few markings. I've scraped pretty much everything I could find off the interwebs, including the following pictures and a few others that are less useful. If you can find anything else I'd appreciate it. There are long discussions on some forums about the Blue Water being developed as an air-to-ground missile for the TSR-2 aircraft, but other notes are pretty definite about that never going beyond a vague proposal and drawing.