Of course they didn't, much like they probably couldn't name more than 2 or 3 England captains of the 25 there have been since him. But nobody has captained England more than him, he won 3 Grand Slams and got to a RWC Final.
That he doesn't work in the media to become well known to the younger audience shouldn't matter. If they Google his achievements, they will then respect his place in English rugby history.
He's probably not someone I would have picked, but then EJ has spent more time speaking to him recently than I have!