Hi Bill,
if you have a build sheet which shows the chassis number, and the engine number etc, this was what I used as proof to register the militant. It was however, back in 1994, and I can't really remember what I did, but I think I rang the DVLA and they sent someone out who inspected my build sheet, looked at the chassis number on the militant and was satisfied. I don't know if I had to wait for them to issue a logbook and registration number before I could tax it though. I'd strongly advise against getting a Q plate, it might seem easier, but in the longer term I think it looks crap. An MOT is a bit of a bind, just ask Jules, another member on here with a militant that needs testing. However we have a responsibility to keep the vehicles roadworthy, which I'm begining to think might be easier if you have an annnual test to attend, that is if you get testers that know what they are looking at! My militant is 1953, and appears in the thread Mk1 militants. We are going to York with the 5.5 gun this Sunday, God willing, so if you see us please come and say hello.
This will keep you busy for a while
http://hmvf.co.uk/forumvb/showthread.php?7394-A-E-C-Militant-MK-1-Gallery