Add some baking powder.

( Neptune A dole queue dosser and foul mouthed chav., Thu 11 Jun 2009, 20:31, archived)

don't know if we've got any of that either

( Moon Girl Technologies horrendous beanbag, Thu 11 Jun 2009, 20:35, archived)

Have you tried ringing all your neighbours' door bells to see if you can borrow a full ingredient list.
Let us know how you get on.
( Neptune A dole queue dosser and foul mouthed chav., Thu 11 Jun 2009, 20:36, archived)