The restaurant group has had to shut around 50 outlets temporarily due to issues with supply of their peri-peri chicken.
Ahead of the publication of its full report in August, the food assurance scheme has outlined what is changing in its revised farm standards from November 2021.
M&S will be the first major retailer to sell only slower-reared, higher welfare, chicken across its full range of fresh chicken products.
Chicken and turkey supplier Avara Foods is currently recruiting for 130 new permanent roles after seeing big increases in production capacity and demand.
East Yorkshire-based Soanes Poultry has invested in a training facility at its factory to address the supply threat posed by a national shortage of workers.
New figures from Kantar show the lamb market thrived in the 12 weeks to 16 May 2021, but primary beef sales declined compared with the high spending levels of the March 2020 lockdown.