As far as I can see, when going to the login screen for the above "not working" they all worked on Opera except Abbey and I got this page
click here . when using F/F for the Abbey, the page just didn't work(graphics and links all over the place)so I clicked on the IE tab page converter in F/F and the page appeared correct and I can access the login page, can't get any further as I do not have an account with any of these sites. Natwest, I knows works for Opera and F/F.
Java script and java perhaps?