Dude ... i shoulda known ... had a TA bitd, but know that in my mid teens a lot of raleigh kids used to de-badge and try to pass off as TA's, did not want to make that basic assumption that it was a TA, cos seat tube looked a bit longer than I remeber, but maybe thats the doughnuts fault! As far as I can remeber they were all stamped while i was into BMXings, - 82-86, but you are right i have seen nice shiny ones on the bay without any stamp, maybe a bit newer than mid 80's without stamp?
Anyhows be careful once its had too much to drink it might lose its way home, and find its way to my house, cos i would promise to love it for a long time...but not in a hostel in Scotland