I too would like to add to MacMillan's sons post and thank all those who have contributed their knowledge to this thread.
As far a heraldry goes I am a ninkanpoop and dunderhead, but with your extremely helpfull explanations, I should be able to work out what is going on in future discusions, well at least to some degree and not simply sit and stare at the screen and think "what are they on about?"

Thankyou again and cheers