Shares in Sepura - the company that I retired from more than 6 years ago now - are still high at over 148p each. In recent months the shares exceeded 152p briefly, whereas a few years they were less than 30p each. They now trade for more than the price when first listed twelve years ago.
I was quite involved in setting up the new company as it was my teams' project that made the new company viable out of the ashes of Simoco - a TETRA portable called the SRP2000. Derivatives of that same product are still being made and sold even today.
See http://investors.sepura.com/prices-delayed .