Because this:
Just because your personal experience of end of life care was good, don't assume the same will happen for everybody. Some conditions will end nastily, despite the best efforts of clinicians, and there was a piece on R4 Today programme this morning from the chair of the board of trustees of a hospice, saying that the whole hospice system is massively underfunded and under pressure, and people are competing for places.
If (heaven forbid) Mrs P-T found herself in a situation where she wanted to end things (she's fine, this is hypothetical) we'd definitely do Dignitas, and I'd be with her. And if I got arrested when I got back, so be it. I'd have my day in court and defy any judge or jury to convict me.