[img]http://d.yimg.com/a/p/ap/20100417/capt.7bc13d30e4324a37840d3a8c320ec170-7bc13d30e4324a37840d3a8c320ec170-0.jpg?x=130&y=86&q=85&sig=2qo7jY7qm4e7BTTu6vulng--[/img]AP - Prime Minister Gordon Brown says Britain is sending Royal Navy warships to rescue Britons stranded by the volcanic ash cloud.