Roald Dahl: Cardiff set for the 'unexpected'

Roald Dahl's centenary celebrations will continue this weekend, with Cardiff being transformed into the "City of the Unexpected".

Organisers have remained tight-lipped about the detailed arrangements, but they say it will be the biggest arts event ever to happen on the streets of the capital.

Thousands of artists and performers will contribute to the spectacle.

Reporter Geraint Thomas had a look behind the scenes.