Yep, I'm assuming I'm just going to have to say no & listen to nagging all week/month/year about it!
It's not block & beam construction, it's standard footings, 50mm liquid screed on top of 100mm rigid insulation. Obviously a membrane barrier in between the screed & insulation, and edging strip around the perimeter.
No the UFH does not run under the island. There is electric, water & waste to the island (ran in ducting set in the screed). No pillar.