Hi Pete
As Sonic says.

As an aside, I had a bit of a problem with my ES-1GT. 628mm scale length and set it as Sonic said.

Later, I was using the ES-1GT as a model for a scratch build and got to comparing it with my Les Paul. I found a difference in the fret spacing for nut to first fret. I then checked the Stewmac fret calculator and found that my Les Paul was correct (as expected) but the kit neck was short on the first fret by just over 2mm.

I suggest a quick sanity check would be worth it. Measure from the nut to the crown of the first fret and then first fret to second fret. Be precise with this measurement though. Check it against the Stewmac fret calculator.

Cheers
Ricky