Thanks, Bhoysgirl.

I guess if a range of people who had success with them told me roughly how much they ate, I'd choose an amount part way between the average and the top and start there. You're right about having lots to begin with and cutting back... that's a better way to go than stating with just a little and then increasing. Perhaps I'll go for 2 every feed - that'll be about 15 a day, which sounds like a lot to me. But then I normally don't eat biscuits and cakes and things except on special occasions.