The company I retired from 6 years ago seems to be doing well recently with their share value at 149.75p currently. Not too long ago shares were less than 40p each. They must be doing something right. In the last few years they entered the DMR market in addition to TETRA and have acquired a base station and software applications house. I would have thought DMR would be a very difficult market with lots of competition and cut throat prices.
See http://investors.sepura.com/ .