Which Login am I are using?
The LGfL USO format is the same as for Staffmail or Londonmail (e.g. jrobinson23.304). Anything else will likely be a Fronter username.
Why has my login screen changed?
London Grid for Learning has moved towards a single authentication system and recommends all schools update to using a USO login. From the 1st September logging into the London MLE by a Fronter username no longer allows you to access other LGfL services or content outside of school.
1.) How do I login now?
If your school is using a USO login format a simple way to login is from the LGfL homepage by clicking on the "login to your LGfL Services" button.

You will be prompted to login with your USO username and password.

This will then present you with all the applications you are entitled to use, including the London MLE. Direct access to services or content will only show a USO login screen.

2.) Logging in without USO
If your school is not using USO, or hasn't linked USO to the London MLE yet, you won't be able to access the LMLE in the above way. Instead you be probably be using a default URL that presents you with a Fronter login screen. Note that your Fronter login will still work but subsequent access to other LGfL services or content may prompt for a USO login.

A full USO briefing document including the compatible MIS systems and details on how to obtain USO is available.