The top mod of r/unitedkingdom has openly in the past stated he was Muslim and they are famous for removing posts involving Muslims like this current one titled: Muslim Children brutally attack Non-Muslim child:

http://www.reddit.com/r/unitedkingdom/comments/3aetm6/muslim_children_brutally_attack_nonmuslim_child/

Last year, they removed a picture someone had taken in a public school in the UK of a poster warning students dancing was haram and music was the work of the devil. There was a bit uproar over this and mods said they removed it because "it wasn't taken by a professional photographer". They have to keep the standards of the sub up, you know. They then added that rule to side bar.

You will notice someone in that thread comments that the mods never removed this post about a Scottish girl bullying and beating up a child with special needs:

http://www.reddit.com/r/unitedkingdom/comments/16odd2/school_girl_abuses_bullies_and_beats_boy_with/

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r/ukpolitics also removed the thread also which makes more sense as the case can be made it isn't strictly politics. Here is that thread though. It got more comments before it was nuked:
http://www.reddit.com/r/ukpolitics/comments/3aewd4/liveleakcom_muslim_children_brutally_attack/

r/ukpolitics has in the past served as a less censored smaller alternative to r/unitedkingdom (they exiled a lot of UKIP supporters to there to keep them off r/uk) but they are cracking down on posts and posters these days.

Here are the subs where you are still allowed to comment on this story:
http://www.reddit.com/r/european/duplicates/3aer9s/muslim_children_brutally_attack_nonmuslim_child/