healey & 18 weeler> Thankyou for your well reasoned replies to my post. I and no doubt many others have been impressed by the logical and rational manner in which you have stated your case and I am now in no doubt you are in the right.
p.s. 18 w, one thing I did learn about 'aviation' during my years as a pilot in the military and in the civil sector was how to spell the word - but I bow to your obviously superior knowledge on the subject itself. Cheers!