At the end of 2003, in Britain it becomes illegal to use a Halon extinguisher, that's why very few places will supply or refill them now. Disposal used to be free but with the impending deadline firms are now charging a fee to discharge and dispose of the Halon extinguishers. Certain full size aviation uses have been granted an exemption in law but not models. It is to comply with an international agreement called the Montreal Protocol due to the environmental effect of Halon. CO2 is the successor for our purposes and 2kg is the smallest available in Britain, though the gross weight is over 4kg, what a lump to haul around.

Harry