I'd like to put a stained glass window of sorts at the top of my landing. Nothing huge but something tall and thin to make a feature. Does anyone know where I can get my hands on one that's not going to cost the earth? I live in Hertfordshire. Also is there anything to watch out for in doing this? There's a window there already which will have to come out and the space altered to fit the new one, but apart from that is it fairly straight forward?