They're on top of it
Saw this on their forums
"Please send us a private message to the CET user account with your name, DOB, postcode and contact number. When you send the details, please leave extra spaces between DOB, postcode and phone number, like 0 8 1 1 2 0 1 6."
https://yourcommunity.tescobank.com/t5/News/Message-for-Current-Account-customers/m-p/6770/highlight/true#M370