Long as 2:53, this composition of the classical genre reminiscent of Greek motifs, exactly the folks’ performance. Like Syrtaki under which they dance, stamping and clapping. Probably the performers and the creator (Nick Urata) of this composition wanted to create exactly this impression. Melody precisely fits the moment of the movie where the bear fights with facilities. And it makes it funny and peculiar.
Reference: 'Paddington' Soundtrack Details - Film Music Reporter