years from 197a to 1982, and it has been operational since 198a, and it has been closed for flood defence purposes on 207 occasions now. so thatis purposes on 207 occasions now. so that is 207 times london has been under threat, that is 207 times london has been underthreat, but that is 207 times london has been under threat, but because of the thames barrier and associated defences, londoners and visitors to london have been able to go about their normal business staying safe from that danger. their normal business staying safe from that danger. let s ust say the thames barrier h from that danger. let s ust say the thames barrier did from that danger. let s ust say the thames barrier did not from that danger. let sjust say the thames barrier did not show- from that danger. let sjust say the thames barrier did not show up - from that danger. let sjust say the thames barrier did not show up in l thames barrier did not show up in time or there was a model that was not as efficien