Yes. The Openreach part with the FTTC socket at the top also needs removing to access the test jack.
As you surmise, it does contain the filter. Re micro filters, you may or may not have one from the FTTC installation, but I expect you have a dangly filter from your ADSLx days, that the phone and router plugged into. To connect easily when using the test jack you use that, though AIUI you can physically connect without it and the FTTC would still work.
Are there any wires attached to either the bottom part or the middle one?
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Edited by RobertoS (Sun 31-Jul-16 10:54:48)