the u.v. torches shown here have behaved well for me (and others I believe).......try www.netpcdirect
dot co dot uk..........substituting real dots and closing spaces.
If anyone gets one of these, it's possibly best to go for the 395nm wavelength version. They seem to have reduced the price recently, and now Sterling £9.99, and with these larger torch varieties you can create enough glow to produce quite good pix for the GMB.