AFFF is far superior to dry powder and the substance in Class F (Oil
Fire) extinguishers. If you had a normal domestic spray bottle with
AFFF in it it would put out a chip pan fire.

That is untrue. AFFF is standard foam and should not really be used on chip
pans. For that you need special wet chemical foam for Class F fires, which
isn't the same as AFFF.

I agree that special wet chemical is the best type for kitchens, as it is
also effective on solid fires. However, it costs over 150 quid a pop, so is
unlikely to make inroads into the domestic market. It only has an 'A' rating
of 13A instead of 27A, so isn't quite so good at solids, though. It has no
'B' rating at all, but this is unlikely to be much of an issue as burning
chip pans come under the 'F' rating, where it excels.

A good type to have in a kitchen is ABC powder.

No it isn't - it is the perfect way of turning a small fire into a
conflagration. Dry powder will not extinguish burning oil and will
scatter it everywhere.

ABC is useful in a kitchen for non-chip pan fires, particularly dustbins and
toasters. As you say, it is very likely to make a chip pan fire worse unless
you're particularly skilled with it. That's what the fire blanket is for.

As we don't even own a chip pan and have had a toaster set itself on fire, I
think I'll keep it around!

Christian.