Falcarius does not know enough about non-British English accents, but the most annoying British English accent is Cockney or Estuary English; what is the deal with H-dropping and Th-fronting?
There are two dialects of the English language Falcarius can not understand: The First is West Midlands English, he nearly missed a train the other month as he can not understand anyone there. The second is Glaswegian, it is like a code language so no English people can understand them without a translator. They don't seem to speak Standard Scottish English (whatever that is) in Glasgow. It sounds like it is made up of a cross between street talk, Cockney, nicknames of places that seem to have no sense, and some sort of non-Cockney rhyming slang which is only known by criminals.
Falcarius' favourite British accent is West Country accent, because he thinks it sounds like pirate speak crossed between farmer talk. The Yorkshire accent is pretty amusing as well.