Thanks everyone for your input. I emailed toiletspares.co.uk and they advised that this is indeed the correct replacement: https://www.toiletspares.co.uk/grohe-single-mechanical-plate.html
With that said, I'm unsure if anything else might need replacing. If I (temporarily) reattach the flush...
Hello! I'm a total beginner and new homeowner - looking to replace a faulty flush button.
Pics here:
The flush itself works perfectly, but the button is stiff and tends to jam, and (as you can see) is also not firmly attached to the wall. It slots on and stays in place, but then falls off one...