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Wiring of a BC switched lampholder with internal earth connection

There are a couple of different ways that manufacturers provide the earth terminal in lampholders. S-Lilley which is a UK base manufacturer use an internal earth connection so there is no terminal seen on the outside of the lampholder.

The switched S Lilley lampholder provide 3 terminals on the inside in both their standard and safer switched lampholders. There is a sprung metal bar that make the contact to the body of the lampholder. This bar can be spurn back to gain access to the earth terminal screw. Being a BC lampholder there is no designation required for the Brown (live) and Blue (neutral) terminals.

Please see here an example of the wiring for these lampholders.