Thank you. The original start screen is genuine. The failed log in screen has exactly the same alpha numeric URL as on the devices that log in OK.
Birdman, all other secure banking URL work. It is certainly a new fault. If I was suspicious I would blame the only common link - Windows 10 - which is common to Chrome and Edge and not relevant to Chrome on Andoid or Silk on Kindle.
The clock is synched and the bank was not a favourite in Chrome.