No offence taken, Slowjet.
However, your answer raises questions for me but I will not --at least, for the moment -- pursue the point as I feel that I may be thought to be intruding. Following up what you have written might look as if I am cross-examining, and this might not be appropriate conduct for an outsider.
I shall continue lurking and trying to learn...... and thank you all for tolerating this.
Last edited by Connetts; 16th Mar 2013 at 08:07.