Went to Waitrose for the first time in months this week, needed sirloin steak for a recipe that needed 2 so bought one of their usual ones (£4.50!! But 3 for £10 so I usually get this deal and put some in the freezer).
Knew I had one in the freezer already so got that one out to defrost at home, it was dated 1 Dec.
The fresh one was way, way thinner than the one from the freezer, I searched for the weights on the packaging and the new one was 150g compared to the 200g one from the freezer! So in a couple of months they have reduced the size of this sirloin steak by 25% but are charging the same!
They are both from the same range, Aberdeen Angus. I've just checked and the Essential ones are still 200g. Just a bit 
at the difference.
Looking forward to when I can get to a Sainsburys again...