PS: now it seems to get more complex than I had hoped - but there is no easy way to valuate
the ZONEs, as they are always changing here and there.
A simple multiplier wouldn't do - we must valuate the hours/zones seperately, and then
sum up for the valuation.

Vice-President of the BOC (Barmy OFFers Club)
Member of the 'Albatros Aviators Club' - "We know how to die with Style!"