THe question probably sums it up, but I've just made "Never-Ending Gingerbread" from a Guardian "We Love to Eat" feature.
Half way through I realised it was very vague about how much bicarbonate of soda to use. I went for the smaller of the two possible amounts.
Otherwise I followed the quantities to the letter.
Its come out looking OK, but tasting more like scones than gingerbread.