The National Eisteddfod could move between two permanent bases in addition to visiting temporary venues as part of proposals to modernise the event.

BBC: Pavilion and Gorsedd

Several other smaller, temporary venues, including the prominent wedge-shaped water-polo arena by David Morley Architects, will vanish for good, though their individual components can be reused.

WSJ: London Olympics 2012 | These Knock-Down, Shrinkable Games | By Hugh Pearman

Part two focuses on the Games' legacy and on the construction of five permanent sporting venues - the Olympic stadium, aquatics centre, velo park, handball arena and Eton Manor - and three other temporary venues.

BBC: 2012 Olympic master plan revealed

Locog's Ms Brock-Doyle said the welding had broken "on one seat at Eton Dorney and on a couple of other seats at the hockey so Games organisers have checked all the seats provided by the contractor to temporary venues".

BBC: Olympic tickets: More put on sale

Meanwhile, Locog says it has checked all seating at temporary Olympics venues after BBC News website readers said flooring below seating at two sites had collapsed.

BBC: Olympic tickets: More put on sale

Temporary seating and venues, like the 12, 000-seat Basketball Arena, will accommodate nearly 300, 000 spectators during the games -- a figure without precedent at any previous Olympics, according to organizers.

CNN: Olympic Park sets gold standard for sustainability

Sections of temporary buildings from London 2012 Olympic venues will be used while the art block is rebuilt.

BBC: Lytchett Minster School temporary home gets 'new roof'