All their books promote local food, buying British, supporting local, and low-food miles. The codes are valid from now until end Nov and are: blackbooks5 (for £5 off £30+ spend on their website)
blackbooks10 (for £10 off £40+ spend which includes their three-book bundle, making it cheaper than Amazon Prime even with their free postage).
To order your gift copies please visit them at https://theextramile.guide/shop