Cheers guys, interesting stuff. Plus, if Raleigh had a blank canvas to work from when they were building/painting my new frame, the head badge could easily have been added (as they were painting the frame any way? Edit, just seen doctorstewie's reply -exactly that)
I must admit, I want it to be a Dyna Tech as this is what I bought with the original Sentinel.
The story behind how I got it back is pretty cool too. It was sold twice (once to a mate from university. He then offered it back to me and I said no, but luckily my brother bought it). I'd forgotten about it until I found this site a few years ago and didn't know if my brother still had it! He did and gave it back to me! And got a mate to help him strip it back to just frame/forks.
Its taken me about three years to save up the funds, but a top member on this forum helped pick it up from my brother, fit it into a small (as possible!) box, send it and now I have it.
Keep the ideas coming if anyone has any other opinions, and yep I think it is pretty much a one off frame. A 1994 dressed as a 1991.