OK - So we thought we should start putting nuts out for the birds again.
Last year, our local farming store had been making the point that it would be cheaper to purchase the larger 12 or 20 Kg bags than the 2kg bags we normally get. We got a 20kg bag.
Got it home, left things for a few days as it was mild (12C ish during the day).
OH put some nuts out, I thought they looked a bit blackish, birds ignored them.
It turns out he had put some of old (purchased in March this year) ones out.
We put the new nuts out, and the birds are starting to come back.
Today, Blue tits, Grea tits and Nuthatches. Robins on the ground picking up bits.