When the SA80 first came into service I believe that it was ahead of it's time in that it was of a "Bull-Pup" design and there were very few army using a rifle made to this principal. The only other armies which I can think of that were using the "Bull-Pup" design when the SA80 first came into service was France and in a very limited way China(?). Are there not significantly more armies today either using or considering the use of a rifle made to the "Bull-Pup" design/principle?
The Steyr AUG was adopted in late 70's by Austria think it was 78 ? so not a new concept, the French FAMAS bull pup, also adopted around the same time, the Chinese "Bull Pup" is a basic AK47 type of design in bull pup guise.