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It was me indeed!
I bought a 15t/15t for an Ultegra RD-6800.
There are actually two spring settings on the original cage (I only realised when I pulled the cage out) so I would recommend cranking up the spring tension on the original one before smashing £75 on one (which is what I paid IIRC).
I initially thought the gear change was much crisper but that wore off after 600 miles or so.
The Fourrier cage comes with 4 spring tension settings so I need to dismantle and crank it up one notch (currently at level 2 out of 4).All in, I ain't pro bro so can't feel the 3 watts saved...
Orient express? I seem to remember someone "on here" has bought these before.