River Thames frost fairs had taken her there for ice-skating on the river Thames. "He got Stevie Wonder to sing for me under London bridge," she says. When Rory expresses surprise that Stevie Wonder sang in 1814, River cautions him that he must never tell the singer that he did. The "Doctor Who" episode "Thin Ice" is set during the final frost fair in 1814, and includes a reference to the elephant crossing stunt. River Thames frost fairs River Thames frost fairs were held on the tideway of the River Thames at London in some of the winters between the 17th century and early
Tunnels underneath the River Thames the Port of London, which until the 1980s required large ships to be able to access the river as far upstream as the City of London. Until the construction of the Queen Elizabeth II Bridge in 1991, the easternmost bridge on the Thames was Tower Bridge in central London. Even now, the Dartford Crossing provides the only way to cross the Thames by road between London and the sea (with predictable results for traffic congestion). The width of the river downstream meant that tunnels were the only options for crossings before improvements in technology allowed the construction of high bridges