Activists celebrated Pret A Manger’s 40th birthday by dumping a 6 foot birthday card filled with angry messages from customers outside its HQ. In the past four weeks, Pret has received 2,200 comments on its social media accounts about “frankenchickens” amidst the ongoing animal welfare controversy. The backlash follows Pret’s decision earlier this year to push back its 2018 commitment deadline to stop using fast-growing chicken breeds from 2026 to 2032 – a 14-year delay from its original commitment. No progress at Pret Compassion in World Farming’s Chickentrack confirms Pret has made 0% progress on phasing out frankenchickens. Campaigners argue that…