After the german rally I'm going to do the nurburgring then I'm in belgium and would like to drive around spa. How do you arrange this or is it normal public road and you just turn up?

any info would be appreciated.

cheers

Only part of the GP circuit is public road.

You need to attend a trackday to drive the circuit.

Check out Book-a-Track, Eran racing, RMA to name a few organisers.