I've seen the £1 suggestion, and it would be interesting to see what happens. Santander's published position is clear enough:
How do I use One Time Passcode if I do not have mobile phone coverage?
OTP can only be used in conjunction with a registered mobile phone with network coverage. However, don't forget that the majority of commonly used online banking transactions do not require OTP. If you do not wish to use a mobile phone then you can still make a payment to a new recipient using your branch or telephone banking service. Once a new recipient is set up, subsequent payments to that recipient can be made online without OTP.
https://retail.santander.co.uk/Estatico ... BS.html#o4
And yet they refuse to adhere to that published position, just to force me (and others?) to provide them with aregistered mobile number. There has to be a deeper reason