why does it need to be "secretly prepared" as stated in the article?

What so unique about whether it is halal or something else. What is important is doing it the proper way. When I slaughter a chicken and cut it's throat, does it mean I'm doing it the Muslim way? I'm doing it the proper way, not necessary the Muslim way. I was brought this way and to me, it is the proper way.

Is Britain a Muslim-dominated country already that it needs "Halal" food? For the Muslim, it's a requirement, for others, as log as it is properly prepared (from slaughtering to serving), it's not necessarily "halal" or whatever term one use!