Duty pay hasn't been changed for years and years I understand. It wasn't taxed previously either. If it is supposed to be for incidental sustenance during a flying day then it is due a hefty increase if you consider what a sandwich / drink costs compared to several years ago.
Also the crew food problem is now fixed with the imminent introduction of a pot noodle. Okay, some may say it's a step in the right direction as now you can get some hot food on the dash, but for me I think I may already be getting enough MSG and e-numbers. Just strikes of minimum effort.