I think for me, it would probably be cockney English. I remember when I went to London 2 summers ago, I ordered something from Starbucks and I couldn't understand the barista at all I would also add Chinese and Korean.
complete mess @ the fight tho
the sneaky PUNCH in the face then subsequent knee to the head
Omg this video
But yeah i think the Scottish accent is difficult to understand tbh. English people can understand me fine but whenever i meet someone who isnt from Britain they always ask me to repeat myself like a million times lol i think its just because Scottish accents are quite harsh.