Legal traditions
I am familiar with patent law around much of the world, though not all kinds of laws, and every civilized country I have worked with there is the right to be heard, an age old legal tradition respected even by countries with a tenuous grasp of democracy. And now the EU has decided there shall be no appeal??
The proposal to take it to court is also unclear - which court? British court might be found to have no standing and courts on the continent might not be a venue open to the British. Coincidence? Probably not.