There will be no fuss as the faceplate is your side of the demarcation point, which is the test socket the faceplate plugs into. So you can relax on that point.
If it's an Openreach engineer they will probably replace yours with a new VDSL2 filter plate with a standard NTE5A on the front. It's a bit bulky but you may find it acceptable. Do you have extensions running off it?
Frequently they bin or take with them the one you have, but will let you have it if asked. To them it's just junk and taking it away is part of tidying up.
If you don't like the bulk you could even reinstate it as now, and not use the new faceplate. But the new filter is better than the one inside yours. Best is to accept the bulk. But! If you do that you may as well have a self-install.
An alternative is to sweet-talk the engineer into leaving it as is! In the early days this often happened. Again, a self-install.
Importantly, are all extensions wired to the back of your faceplate, or is there an earlier junction box they run from?
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
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Edited by RobertoS (Wed 19-Aug-15 22:41:31)