Updating original question of 6th February.
Green White Blue - You helped with my original query about which exit giving precise instructions. . Our hotel has now changed to the Helmsley Park Lane, 36 Central Park South. Is your instruction still the same as to which exit to use? Our train now arrives at 6.35pm so would imagine would be lookikng for a taxi around about 7.00pm once we sort luggage out. Any easier getting a taxi at this time of night? Thanks for your help.