BT Web Address Help

I've just noticed this evening that invalid web address requests in Chrome are now returning with this new page as opposed to the typical Chrome 'error' message. How long has this been the case? It's not a problem, as it can be disabled but I'm curious as to when it was introduced.

BT cashing in on typos and dead urls, seems to go back to September 2010: http://community.bt.com/t5/BB-Speed-Connection-Issue...