I really cant stand the flapjacks but I am glad they are working for you.
As far as I am aware you can have 3 a day. It doesnt matter if it is 1 shake 2 flapjacks or 3 shakes or 3 flapjacks. As long as you have the 3 for the day it doesnt matter. I have never heard of them being limited.
I tried my first flapjack (if you can call them that I think the trades description department might have an issue!!!) Jack**** is more like it for me.... was really one of the worse things to have ever passed my lips. never again!
I also used to like the flapjacks, but for some reason went off them completely when I restarted!
The only stipulation that I have heard about the flapjacks is that you have to drink an additional L of water for each one that you eat. I only ever ate one per day but can completly understand how good it feels to eat something!! I used to enjoy my coconut flapjack and a cup of peppermint tea, plus it was so handy when out!!