Jamie Roberts remains the pounding heart of stone in Wales midfield

The Harlequins centre has played a staggering 31 consecutive Six Nations matches and, very much like when he has the ball in hand and try line in sight, shows no sign of stoppingEight years since his international debut are we any closer to discovering what, exactly, Jamie Roberts is made of? Because it surely isn’t just flesh and bone. Granite and gutta-percha, perhaps, or oak, tar, and iron. Next time Roberts is cut take a close look at the wound to see if you can catch a quick glimpse of the adamantium skeleton government scientists must have grafted to his bones when he was a young boy. In…