Heh heh, just how dumb are the British? They'd rather take their chances with a cryptosporidium infection from contaminated salad than harmlessly irradiate the lettuce leaves and kill the bug, because they are too stupid to accept modern science. The irradiation process makes food more safe to eat, but like our silly, child-like hippies in America, they irrationally fear anything whose name contains the following sequence of letters..."r-a-d-i-a-t-i-o-n",
If you are a dumb hippie, pay attention; irradiated food is not exposed to any, ANY radioactive materials, just the naturally occurring waves we are exposed to every day as part of the normal wave spectrum.....gamma, X-rays, and accelerated electrons. The food doesn't retain any of this irradiation, but the pathogens are all killed.
Now quit yer whining and have a salad.