While the entire nation rushed to get June 21st booked off work, brands were piggybacking on the national good mood this week, launching PR campaigns that won headlines everywhere. We’re doffing our caps to Hasbro, who re-imagined a classic, Pretty Little Thing, who seized on the June 21st hype, and H&M, who showed lockdown lessons have a place in the future. The British Medical Journal, however, was forced into an embarrassing u-turn after getting it very, very wrong…