Sir George Cayley
You are wrong.
Flammable and Inflammable have the same meaning.
If you don't believe me, try the Oxford Dictionary, see below for extract.....
inflammable
· adj. easily set on fire.
· n. a substance which is easily set on fire.
– DERIVATIVES inflammability n. inflammableness n. inflammably adv.
– USAGE The words inflammable and flammable both mean ‘easily set on fire’. Inflammable is formed using the Latin prefix in- which has the meaning ‘into’ (rather than the more common use of in- to indicate negation), and here has the effect of intensifying the meaning of the word in English.
Are you by any chance one of the people whose recent success in GCSEs (or whatever they are called this year) we are told we need to celebrate?