Why is the Moto2 race after the MotoGP race at Silverstone?

Noticed this in previous years when I have attended and have just looked at the schedule for this year and it is MotoGP at 13:00 and Moto2 at 14:30 local time. What is the reason for this? Pretty sure every other circuit throughout the year the GP race is always the last one?
Submitted August 19, 2018 at 09:18PM by jjrrcc11 https://www.reddit.com/r/motogp/comments/98n7zb/why_is_the_moto2_race_after_the_motogp_race_at/?utm_source=ifttt