Yes, in the video, I was priming it quite a bit, and as you say I think too much. Seems now I just prime it so I can heard the injector creak, also the oiling cup, needs to be primed to get some oil down into it (Somehow when I had the head off and was cleaning it up, I missed this and it was blocked), then once cranking it needs a few more turns after the decompression lever is dropped. You can feel it wanting to start and if you give it a few more turns to help it along it will now normally start first or second time. Once its started the first time for the day, its usually pretty easy after that. As you say, seems just to be a matter of working out the best procedure and technique for yours and generally disregard whats in the manual.
From what I have read the Bamford SD are notoriously difficult starters.
The decals I got from Rally Badges Online. Was looking for some for the Lister CS originally, thinking there would be nothing for the Bamford, but sure enough, they had some. From what I can tell it looks pretty original.