That fails on two counts:
1) You spelt it the American way.
Oh, please.
a. Not every member is from the UK. ( I'm American )
b. Not every member is posting from the UK.
c. Type 'moisturiser' in Google.com and the reply is "Did you mean: moisturizer"
d. Type it in Wikipedia and it is redirected to 'Moisturizer'.
So, ha!