A FREE screening of David Attenborough's Blue Planet will take place today and tomorrow, but there's a catch.

People who go along will be treated to snacks, drinks and a screening of the much loved nature documentary but need to fill in a survey before and after.

Read more: Council websites down across the county

The event is being run by students at Oxford Martin School on Broad Street, where the event will be held, with the idea of studying the impact of media.

The screenings will start and 4pm and run through till 8pm. Places are free and open to everyone but are limited. Visit zoo.ox.ac.uk/event/blue-planet-movie-night