Disco 2 Tie down points in the boot

This is going to sound like a stupid question, but someone will be able to tell me without me stripping the carpet out.

Are the lashing points bolted down? If so, are the bolts captive/welded or do they go through the floor?

I ask because one of mine has come free - it's clearly corroded through.

They're retained by bolts into captive nuts under the flour pan.