Hamilton admits it's going to be a difficult start to the new F1 campaign

Seven time world champion, Lewis Hamilton, admits it's going to be a difficult start to the new F1 campaign for Mercedes.

Practice ahead of the season opening Bahrain Grand Prix is underway.

Hamilton's team have struggled in adapting their car to new rules.

The Brit says he expects them to be some way behind last year's winners Red Bull in the Middle East.