Stu (theduck) was premature and guessed correctly, even had the right colour bottle. I was going to load some photos but the option is no longer available.
Hopefully my engine will survive if not, its only an afternoon to fit another. Starting off with 55hp jets because I do not have to retard the engine ignition or fit colder plugs, it is a fully managed Zex (yes Zex not Sex) system with single a fogger for fuel and nitrous. I have a bottle warmer, auto-bottle opener and just for fun a purge switch which I suspect will be used more than actually driving.