The new BSI standard for extinguisher installation does make it necessary to pay somebody knowledgeable for the art of installing and commissioning. However, who says that you need to follow BSI's guidance. After all BSI standards are mainly voluntary guides. If you are a private individual you do not need to install in accordance to BSI at all. If you are a business or rent out etc your insurance might tell you how these extinguishers are to be installed installed.
If you decide to do the install yourself, just weigh the extinguisher, record the weight, keep the invoice, check that nothing is bent or dented and that the pressure gauge is in the green. And then just ring a servicing company after one year to service (if you are a business or have to do fire risk assessments). If you are a business and you install yourself, just make sure you know how many extinguishers are needed and where they are to be installed.
T
