I recently purchased my biggest ever bit of glass - almost 2ft long x 9" wide - which makes it a little hard to post a meaningful photo but I've tried an overview and a close up :http://glassgallery.yobunny.org.uk/albums/userpics/10086/normal_smallerDSCN1221.jpg
Although not immediately obvious, it was signed and my search lead me to the website which might be useful for other people to see so I have posted it here :http://www.myglassstudio.com/indexb.html
It's not the easiest site to negotiate, but I suspect a lot of this glass will be hitting the boot sales, auctions and charity shops soon, so worth looking at.
They make slump and recycled glass products and a few pieces are very Scandinavian in appearance which could catch us out. Their mark is an etched bull logo with GLASS STUDIO printed, but it is hard to see on the textured finish.
Hope this might help some of you - I wanted to do something to say "thank you" for all the help I've had. I really hope I can contribute even more in the future.