have you googled "foundation courses for eu students"?
"foundation courses in the uk for [enter your country, eg polish students]" should return the results you are after.
the uk is committed to eliminating all discriminations.
edit, try also "[enter a university name] foundation course, eg nottingham university foundation courses."
try the british council as well.
the purpose of foundation programmes is to prepare those with non-uk education or alternative qualifications for degree programmes. i personally dont see why they shouldnt accept eu students. those programmes help students improve their english as well and they are supposed to be fun with a lot of activities.