I have recently discovered that young chickens are pumped with growth hormones and also fed a dodgy diet so that they become meaty very quickly.
I am assuming that these don't happen to British chickens.
A lot of fast food companies import chicken from East Europe and Thailand. I have a feeling they don't have the same quality control standards.
This has kind of put me off from eating chicken. I now go for lamb or beef. But, who knows if they go through the same growth hormone treatment as well!