I got a message back from Electric planet. They are getting them in and if they don't have them, they can order them. However, it is going to cost $100 USD for the bottle and shipping. I just can't stomach that. Anyone on that side of the pond can get it here cheaper?
Its actually blue/red and not violet. The reason for the lamp is to go alongside the "Made in Britain" programme and to celebrate that fact that the Astro is still being hand made in Britain after 46 years!