No, it's a slow and pretty "common" British accent, and if I was more used to listening to British English I guess I would understand everything. But I'm not used to British accents, so I can miss even the simple words, plus the vocabulary used in that clip sounds pretty advanced to me. So yeah, I can miss several parts, but it's me, it's not because of the accent, which sounds like "normal" British English to me.
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