I didn't see the report, but unless there has been a dramatic change the tipping point was predicted by a report in 2008 to be in around 150 years.
I am sure it will change again anyway, if you go to the Natural History museum they have an exhibit about the changing shape of Britain of the years (the Thames ran through where Norwich is now at one time!}, at different times it shows no Bristol Channel at all and at other times Glastonbury Tor as an island in the Somerset Levels. I know we saw bad flooding in the levels in recent times, but this was for a 1000 year period less than 5000 years ago.