Maccies, Sainsbury's, now Greggs. Who would you target next for a bit of hacking if you wanted to cause the most chaos for Brits?

Lots of bricks-and-mortar retail chains live on thin margins, and have really lightweight IT where they tolerate a bunch of legacy stuff rather than spending money on upgrades. Why spend £1m on new servers when that would add 1p to the cost of a tin of beans? I've worked with two big supermarket chains in the UK; both had backoffice IT that was really lightweight and sketchy when compared to, say, banks and government ministries which are full of bureaucracy and policies and committees and controls &c. (Of course the government ministries still have some crap IT, but it's crap in a different way and costs 20x more). My favourite was a "remote working" system where supermarket Head Office people would literally use a personal device at home to RDP into their assigned desktop, on their desk. And from there they could open a browser and access webmail. Or, a few years before that, every user account provisioned with a predictable name and the same initial password, and no password expiry. So everyone could log in as anyone else as long as you know their name. We found a purchasing officer whose onboarding hadn't been completed but he just used his colleagues' email addresses &c, the rest of the purchasing team went along with it, it went on for two years before I found out. There were PAs who'd simply log on as the boss. If Raj the Temp is brought in to replace Sally the Logistics Officer whilst Sally's on mat leave, the logistics team wouldn't bother asking for a new account to be set up, Raj would just log in with Sally's account and sign forms with Sally's signature for a few months. Simple! Sainsburys used to have some super strict change control, I'll give them that. You couldn't touch *anything* in the run-up to Xmas because everybody's terrified of disrupting the most profitable month of the year.