Thanks everyone for the comments.

That's especially nice knute to hear that with your dd's dysgraphia she still scored well on the coding. It's hard without knowing more exactly what the subtests are, how many letters or whatever they write, to know whether to push for substitution or not.

I guess we will just go with the flow and I'll bring up his motor skills some weeks ahead so the tester can have a chance to think about how best to handle it.

Polly