Scroll down on this page to see a video about SRVLs. I think the chap says the aircraft stops in 200 feet? I'll have to watch it again eh.
Queen names new Royal Navy aircraft carrier in Rosyth 04 Jul 2014 BBC News UK
"The BBC's Jonathan Beale looks at how to land a fighter jet on a warship"
BBC News - Queen names new Royal Navy aircraft carrier in Rosyth
CVF LSO Display from Video above: