"Good old ergs; I haven't seen them since A-levels. I remember working out complicated (at the time)problems and ending with 'cgs units' as trying to work out the units for G, say, was totally beyond us."

CGS, eh? Damn these new-fangled systems. I'm an FFF man myself: furlongs, firkins, fortnights. And the speed of light in furlongs per fortnight is HUGE.