HMS Astute (S119) (possibly S120) is the lead ship of her class of nuclear-powered attack submarines. Astute was ordered from GEC's Marconi Marine (now BAE Systems Submarines) on 17 March, 1997. ...
http://en.wikipedia.org/wiki/HMS Astute (S119)
HMS Astute (P447) was an Amphion-class submarine. Her keel was laid down by Vickers at Barrow-in-Furness. She was launched in 1944 and commissioned in 1945.
http://en.wikipedia.org/wiki/HMS Astute (P447)