Several years ago I had a similar bag from different manufacturer but noticed the weevils straightaway, returning the corn to the corn merchant who gave us a different brand, and said he would take it up with the manufacturer. I've never used the brand since, I've also had rat poison in a bag and complained to trading standards, but they said there isn't a 'standard' for pigeon corn (so that's OK to poison my birds then) it was blue pellets so noticed pretty much straightaway, it was a bag of hemp this time, the manufacturer said 'we don't use rat poison' and sent me another bag of hemp - you could see the blue pellets in that one without even opening the bag, nobody gives a toss! All you can do is boycott the corn like I have done - and maybe have a go at them at Blackpool if you have an audience!!!!