South coast sea levels rising

Researchers at Southampton University have used data from numerous sources and show that sea levels along the South coast of England have been rising over the last century. A serious flooding event that would have occurred once in 100 years in 1900 would now occur once in 10 to 25 years.
As sea levels continue to rise, the events are going to increase (once every year or so) and obviously eventually it won't be possible to defend Portsmouth against the rising waters.

I wrote a post a while ago suggesting that Portsmouth would have to be abandoned as the seas continue to rise.
One assumes that such news would eventually affect property, land prices and insurance cover, one wonders when this would happen?
Portsmouth City Council won't discuss it or even mention it. Southampton is planning a large barrier to fend off the sea, but as an island, Portsmouth is doomed to become a modern Atlantis with the Spinnaker tower poking above the waters.