Thanks, Twinsnan. Got it now
56 Think of the 1968 film starring Roddy McDowell and Charlton Heston which ended with the statue of liberty submerged, (one only), then surround that initially with other words in the clue.
99 Retain the centre of a tennis court
Joanne - definitely smoking related. Look around the entrances to most public buildings in the last few years to find the evidence