brit pete:
okay DD i admit I was only describing for vehicles over7.5tn is this any better
ADR para 8.1.4 concerns fire extinguishers. The table below sets out a summary of the minimum requirements. Note that dry powder extinguishers are specified because it is known that they are suitable for tackling fires of class A (solids such as wood, paper etc), class B (fires involving liquids) and class C (fires involving gases).
Vehicle (max permissible mass) Minimum dry powder fire extinguisher provision
Up to 3.5 t 2kg for cab
plus 2 kgvehicles
over 3.5 t and up to 7.5 te 2 kg for cab
Total 8 kg (usually one 6 kg but other provision is acceptable as long as there is one 6 kg)vehicles
Over 7.5 te 2 kg for cab
Total 12 kg (including at least one 6 kg)and this little addition
Any vehicle carrying dangerous goods under the” small load” limit or carrying only infectious substancesall this was taken from this LINK
ME I ACT LIKE A BOY SCOUT ; be prepared better too much as not enough,
Hi Pete,
That’s spot-on now mate. 
I can also tell you that the fire extinguisher requirements aren’t going to change once ADR 2011 comes into force, so we’ll be carrying on with what you’ve quoted in the link for at least the next two years.