>>2932423
No adjustable wrenchs or basin pliers go over it. It's too flat, too large and the plastic is too soft. Any attempt just falls off.

I've just had a go at it with a jr hacksaw and... Nothing. Pretty sure I've gone all the way to the ceramic, cutting as close as possible to pipe. Nothing fell off, no sign of any loosening. I tried drilling but the bit was sliding all over the place and given I have to drill way too close to my face because of how little space there is (see pic), fuck that

The entire thing is simply fused to both the pipe and ceramic