Exorcism Boy (British style, handsome doujinshi male protagonist)
Vampire Knight (Existing two seasons, about vampires, no explanation. The painting style is gorgeous, the characters are beautiful)
Pandora's Heart (British style, love Blake and Stone in it. Super love inside Blake, stone's voice is super gorgeous said ~)
Sakura Ran High School Men's Public Relations Department (campus, funny, super 2 and warm.)
Sakura Ran High School Men's Public Relations Department (campus, funny, super 2 and cozy. In short, it's an excellent anime that can't be beat)
SA Special Advantage Student (and Sakuran is very similar to the president of the maid and also have the same point of ****. Campus, funny, love)
Rebel Rurusu (which also has a campus, royal family, revenge. The social background is darker than Black Deacon~)
Ao no Exorcist (Campus, gods and demons. But instead of master and servant, it's brotherly love. The anime is awesome~)
Today Starts as a Demon King (BL ambiguous, otherworldly, aristocratic, master-servant, funny. The characters are also very beautiful~)
Steel Alchemist (a bit British, 15 year old doujinshi male protagonist, army, combat)
God's Fantasy Partner (friendship and growth, gorgeous British style, mild BL ambiguity)
Phantom Boy (I've seen a bit of it, and I think it's a bit similar to Deaconess Black but not as classic as Deaconess Black)
Sun of the Sliding Ghosts (not British, but related to school master and servant, I guess). But it has something to do with the school master and servant, I think, the main character is the young master. Two seasons, personally prefer the first season)
Loveless war Loveless (also only seen a little, BL ambiguous and black deacon some similar, but no black deacon classic)
Fate stay night/zero (two, barely count the master and servant, the holy grail war. Personally, I'm watching it~)
Natsume youjin account (not British style, Seishin style, people and monsters, campus)
Cyclone butler (funny, master and servant. Personally, I've only read a little bit of it~)
Zero's Envoy (Prissy loli heroine and horny loyal dog hero, magic, harem)
XXXHolic (Fantasy, similar to Master and Servant. Personally, I've only read a little bit of it and don't really understand it~)
Bewildered Butler and Cowardly Me (female cross-dressing butler, harem, hilarious)
First half of the book is super recommended, all are personal favorites, and I've read all of them more than once (with the exception of the first new one~).
The second half of the general recommendation, I do not like the harem movie said, or do not quite meet the requirements of the British style. Personally haven't seen too much of it, so I'm not going to pack my bags~