Thank you Allan, RAGIII and Dave for your kind comments.
I am a bit miffed about the pictures posted, after taking another load of them under several different conditions today I came up with one good one. This shows the weathering. I am not sure if it's purely me or if coloured pencils are camera shy in the same way as some varnishes are on archive pictures. In any case I will get someone else to take the pictures for the completed models section.
Alan.