thanks dave for your support.
thanks to the folks who went to the trouble of answering. as it happens i look at them in the flesh so to speak every working day of my existence. i just thought that as they looked so similar if there was some little clue to look for that would differentiate (aviate that means the difference between the two) at first glance.
six mile, i was already aware of the little winglets thanks, but also good of you to reply.
aviate, re read my original post please, paying special attention to the last line prior to my signature, you CHUMP!
regards
TFC