The Singapore Hilton was a hotel in Singapore. The Eighth Doctor said that he once met a Venusian at the hotel at some point after 1930. (AUDIO: Storm Warning)
When Charlotte Pollard met Alex Grayle, she agreed to meet with him at the Singapore Hilton on 31 December 1930. (AUDIO: Seasons of Fear) At the time, it was the furthest place that she could imagine. (AUDIO: Storm Warning) After a number of adventures in the TARDIS, she arrived at the hotel and met with Alex. (AUDIO: Seasons of Fear)