Question Author
Thanx all, I did think about the fish tank idea as I saw it in another house I viewed, but me being me I would probably forget to feed the cat as is often the case with my kids (godsend now they can talk properly). I'm not sure the wall would be thick enough anyway. Boo have extensively googled stained glass and am amazed at the designs, they are wonderful but I imagine outrageously expensive. I might see if I can find a student who wants to take on the job if I can find one. Buildersmate, thanx for your answer, I think the window is definitely over 800m off the ground so I should have no worrys regarding safety glass.