Lewis Hamilton told to "up your game" as George Russell pressure is "really hot"
![Lewis Hamilton told to](https://i2-prod.mirror.co.uk/incoming/article29100239.ece/ALTERNATES/s615/0_GettyImages-1402441027.jpg)
Russell beat Mercedes team-mate Hamilton last year and will be gunning to do it again, though Johnny Herbert thinks the seven-time world champions still has something special in the tank