Tick, tock...

Lots of football matches over the Christmas period with lots of opportunities for managers to complain about the referees and specifically the amount of time they added on at the end of the game - or didn't as the case might be.  And yet there's an answer to this - an answer that's been around for as long as I can remember. The Game Clock.  This is a clock which stops every time the game stops - so you get an undisputed period of real play.  No arguments, no guesses.  Every time the ball goes out of play, the clock stops.  Every time the referee blows his whistle, the clock stops. The idea is so simple.  The only thing you would have to decide is - how long should a match last given that it represents real playing time with all the stoppages removed? Thirty minutes each way, perhaps?