By way of at least partial closure on the question regarding copyright
of the designs here is an update. I emailed two major studios, Willet
& Hauser and Lamb and I am pleased to say that both of their chief
executives gave their blessings to photographs being published subject
to due credit being given to their studios for the works. These are
both studios which have produced relatively modern works which I have
seen and photographed and I am pleased that they are taking what I
think is a sensible and enlightened view. Of course this does not
cover the entire spectrum but bearing in mind that I tend to
specialise in older glass I do not envisage a huge exposure.