Wow, brilliant :D .
Thanks to you both: "alastairreid" and "Nige F" (in this reply, and the "clickable" type)
(Feathered edge, yes, spot on, now that I think about it.)
Much appreciated.
Thanks to this website, and the kind souls who give time and advice based on professional (or expert amateur) experience, I have learnt a great deal.
However, I have not been able to find an answer to my latest query, so I will have to trouble someone on here.
I am renewing the fascia...