The use of Halal chicken by KFC, has been a subject matter of great debate since a long time across the world. However, it has not been proven either way & Muslims continue to visit these stores & consume chicken & meat assuming that a reputed MNC like KFC will use only Halal chicken for its delicacies.
Unfortunately that is not the case and we have been able to discover this fact right on KFC's UK website. KFC admits that Halal chicken IS NOT used in any of its stores.
This should come both as a warning and eye-opener to KFC's Muslim customers. When the chicken is not halal, it is HARAM for all Muslims & they should understand this fact completely before visiting any KFC store again.
The following link shall clear any doubts you have about KFC chicken being HARAM for Muslims:
http://www.kfc.co.uk/faqs.aspx