This has only just come to my attention as Pay Up! blocked me on Twitter. I can't see anything on their website why their planned protests were cancelled:
Due to circumstances beyond our control - we've had to hold off on the weekend of action. There are developments. More info soon.
Well they've had a week and a bit now and no further info on this. What is highly probable is that Unite and Sainsbury's staff told them to fuck off because as mentioned previously, their actions would undermine the efforts of the union to negotiate a better deal for staff. Epic protest fail.