Tesco Bank has all the contact details it needs to send something out by email or text, but apparently we had to be in online banking to see the notification. So if you didn't look at your accounts last week then hard luck apparently.
This is not intelligent or courteous customer service and nor is putting an on screen message saying that there are no accounts under one's login. Surely not beyond the wit of man to put some clear and less alarming communication as to why services were not available.
Also experienced declined card in Tesco store and the Tesco ATM down at the same time as the above outage. The agent I spoke to was not sure if these could be connected and had no definitive information. BTW it was the fraud number that I called a) because it is the only 24/7 line that TescoBank offers its' customers and b) because declined card followed by the system telling me I had no accounts made me think the worst.
All in all a very poor impression given by Tesco Bank in managing communications on upgrades and maintenance. Still need to investigate what led to the card declination but this is very embarrassing in a supermarket checkout queue (Tesco of all places!). If this turns out to have been connected with the systems maintenance then I will looking at moving banks.