Traditionally the Campingaz R 907 has been the only choice.         Now the new Leisuregaz  007 cylinders are always available.         The Leisuregaz 007 is virtually identical to the R907 and has identical fittings and can use the same regulator. It is much cheaper and they are always available as they are refilled in Manchester rather than Lille in France.  The Leisuregaz network is growing rapidly.