DB - c'mon. We're talking additional freight and pax to a third world
county here. Most 'stuff' (pax and freight) gets there eventually by flat bottomed boat - easy, cheap and reliable. S92 - WTF? How much is that going to cost each year?? And to achieve what?
Look - air passage to the Scillies is a luxury, nothing more, nothing less.
Islander - £3/week to run. £20/year insurance, £50/yr maintenance and you can throw it away after 10years and get another one.
You know it makes sense................(or HS2 could overshoot a little, perhaps