No idea about Waterloo, sorry.
What sort of bike are you talking about? A non-descript commuter well locked-up will probably be ok at Farnborough unless you are unlucky (my cheap Pinnacle hybrid has been for the past year or so, but that’s Mon-Fri).
But if it’s anything nice, I wouldn’t. Found a girl searching folornly for her bike a couple of months ago, couldn’t do much to help her except make sure she had an alternative method of getting home safely.
Likewise a poorly secured bike, even if it is plainly an ancient wreck (like my Dawes MTB, which probably injured whoever stole it from the station).
Judging by the number of police information leaflets, notices, frame-stamping campaigns etc at Farnborough station, its clearly a big problem there.