It looks like a piece of studio glass. It's an easy shape to make and easy colouring technique to use, unless, of course, I have to do it. I don't mean that studio glass is easy to do, just that it looks like the maker of this was at the beginning of his or her career. Try Googling variations of the name that's there. I fiddled about with the image after importing the photo and couldn't make out anything.
Recently, I've come across pieces of glass that have "signatures" on them but are clearly from the the Far East. Apparently they're sold in slightly more upscale furnishing places as Studio Glass. I'd guess from the boot sale reference you're in the UK, so I don't know if the same thing happens there.
David