Having a fire extinguisher is no guarantee you’ll be able to put out a fire with it. To be ‘fit for purpose’, every fire extinguisher you own must be subject to careful and regular servicing and maintenance to give you confidence that it will do what you wanted when you bought it. A British Standard Code of Practice (BS 5306) recommends that your fire extinguishers are serviced at least once a year by a competent person, to be sure they’re going to work effectively.
If you’re unsure what’s meant by ‘competent person’, you can find out about that, and lots more useful information about service of fire extinguishers in our advice centre pages.