I was planning on doing the same in NZ. I would be keen to chat to you about it (email in HN profile). I am a data scientist

Did you notice anything pre and post Whittakers price increase(s)? They must have a brilliant PR firm in retainer for every major news outlet to more or less push the line that increased prices are a good thing for the consumer. I noticed more aggressive "sales" more recently, but unsure if I am just paying more attention.

My prediction is that they will decrease the size of the bars soon.