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Online Banking

What is a Temporary Security Number and when do I use it?

A Temporary Security Number is a code we use as an additional security measure to confirm your identity if:


  • you're registering for Online Banking for the first time


  • you've forgotten your login details


  • you're using a browser on a computer or mobile device we don't recognise and we don't have your up to date mobile phone number.


We'll send the Temporary Security Number to you by text message, if we have your up to date mobile phone number. If we don't, we'll send it by post and you'll have to wait for it to arrive before you can log in to Online Banking.


When you receive your Temporary Security Number return to the Registration or Login screen. You'll be asked to enter the Temporary Security Number in full to complete registration or reset your login details.


Your Temporary Security Number is valid for 30 days from the date it was requested and can only be used once. If it expires, you'll need to contact us to get a new one.


After waiting ages I’ve now received the temporary security number but now it keeps saying it’s an incorrect number. I urgently need to get onto my account and I can’t because of this number and needing to change my contact details. I tried phoning but again it wouldn’t let me stating the security number was incorrect. I’ve never known such a difficult process to get onto a bank account. 

Sorry to hear that @Megan040797. I've sent you a private message, if you could respond I'll look into this for you. 


I should like to access my account and need a temporary security no. I only use one computer which is not recognised. My mobile no. on my device hasnt changed either for some reason unable to use my password (which hasnt changed). I should like to set up a new password and can you please advice me of the current figure owing on my account. 

@POLL3NSA If you no longer have a recognised device, we will need to send you a Temporary Security Number (TSN) to reset your online banking and allow you to get logged in again. If you would like us to arrange this for you, please privately message @CET with your full name, DOB and postcode, and we'll do so. Alternatively, you can call our Online Helpdesk anytime on 0345 300 3511 and request a TSN to be sent by text immediately once security is completed.


Can I have a temp security number ?

Hi @A9, please privately message @CET with your full name, DOB and postcode and we'll be able to sort this out for you.


I need a temporary security number as I am locked out of my Internet banking. Thanks 

Hey @Jennasmith01, thank you for getting in touch. So we can get this sorted for you, can you please privately message us @CET with your full name, DOB and postcode? :) - Cheryl


please can you text me a new temporary security number,lap top has not been .

@Thehoff I've replied to your private message.