Liam Lawson handed rare F1 practice warning

In a Formula 1 rarity, Liam Lawson received a black and white flag during third practice ahead of this weekend's British Grand Prix. 

The Racing Bulls driver received the warning for erratic driving, moments after being noted for an incident with Pierre Gasly. 

Lawson was briefly noted for overtaking Gasly then slowing back down ahead of Copse corner, where he blocked the Alpine driver as he attempted to move back around the outside. 

It was judged that no further action was required; however, a black and white flag was shown to Lawson instead.

At the time of being shown the flag, Lawson sat 10th on the timesheets, whilst Gasly was at the foot of it.