Oh Santander can get in the bin as well! Honestly never had so much hassle as trying to close my deceased Nan's bank accounts with them. Terrible attitude and system.
Sky
Ryanair, unless absolutely necessary. Had to fly with them from Madrid to Manchester when visiting someone in Cumbria for the weekend. No other airline allowed us to get there and spend meaningful time with them; we even loked at going via Belfast to Carlisle! Felt dirty flying with them...