Jack Taylor wrote:

Like you, I find it surprising that it wasn't continued on to the South
Bank and either linked to the upstream Hungerford Bridge (I refuse to
refer to them as the Millenium Bridges!)

Quite right; there is only one Millennium Bridge in London, and that is the
one between St Paul's Cathedral and Tate Modern. The Hungerford
footbridges are officially the Golden Jubilee Bridges, though about
one-sixth of their cost was covered by a grant from the Millennium
Commission.
--
Richard J.
(to email me, swap 'uk' and 'yon' in address)