UK Association of National Park Authorities has a compeition for National Park photos.

http://www.nationalparks.gov.uk/termsandconditions

 T&Cs include this:

By entering the competition, you grant the UK ANPA a non-exclusive, irrevocable license to reproduce, enlarge, publish or exhibit, on any media, the images. This may include, but is not limited to:

• News coverage of the competition
• UK National Parks website
• UK National Parks Facebook fan page
• UK National Parks Twitter feed
• Exhibitions
• Publications – such as leaflets and reports
• for use in press releases to be distributed to national, regional and specialist press giving information about or promoting the 2012 competition.