I attended this hall for a few months 6 years ago and it was not a particularly thriving congregation then, there's also the big hall on Haydon's Road Station only a few minute drive away which is pretty new so I am surprised the Wimbledon one has been going this long.
I just checked the JW.org website and the address of the Wimbledon cong is showing as Haydon's Road so this news seems to be true.