What on earth is so offensive about a Bible? Were they forcing students to read them at gunpoint? I am a Christian, but if I saw a Koran on the table, I would pick it up and read it out of curiosity. I would never even think about being offended by it! I've never understood why people think it is offensive to hear or see different beliefs ... unless their own faith is so weak that they are afraid they will be converted!
You nailed it! I think they (the evil-doers) are really afraid people may begin to actually, think, when they read a Bible. Remember the words from 1984, "Ignorance is Strength". This is not about diversity.
Especially in the context of a kinddom where the Queen is also the head of the Church. You might think that understanding the Queen's religion would be a good education for foreign students.