Dropped the lazy bit. Edelrid site gives I think 9.9kN when used as a single (it says 9.9 / 7.3 / 11.8 kN and I think logic suggests the 9.9 is when tested as a single). Their Heron single which is 9.8mm, so a fatter rope, says 9.3kN. So yes high forces, but possibly not a big jump in value?
I would be using this mainly for easier climbing so high FF unlikely and more likely to be bouncing down a ridge!
Thanks for the input.