Excess data usage - Apple Watch ultra

So it's 11% of total wi-Fi. Not cellular.

What are you streaming through it?

There's not enough on-board storage to use that much data every day just for sync'ing icloud media.

I am staggered at 1.2TB in 24 hours in the TV.

What are the figures for last 30 days?

Can you post a screen shot of where you are seeing this usage statistic.