Summary in this quarters FIA Focus:
http://tiny.cc/1mua6Full raw data-
http://tiny.cc/r61ng(TINY URL used to cut down original links which were very long!)
80% of fires on sites with extinguishers maintained by a member of the trade associations (& thus reported for the stats) were put out only with those extinguishers & no further assistance. 75% of fires did not result in a 999 call and fire service attendance (hence why fire service collated statistics on extinguisher effectiveness are flawed).
The raw data is of use for an insight into causes of fire and the number and types of extinguisher used.
Interestingly smaller capacity extinguishers were more effective than large ones (91% v 86%) with the supposed champion for electrical equipment 2kg CO2 failing on several occasions.
The biggest surprise is that the 3 litre water additive (of which the Chubb Hydrospray is the most common example in use by a long way) extinguisher had 100% success even on fires it is not intended for (electrical). However before everyone runs out to buy one the statistical sample was very, very small.