Hopefully all who are competing at Spa know this already, but if not, a quick heads-up!
The licence requirements for compeing abroad change this year. You still requre a National A Licence as a minimum, but you also need a letter of authorisation from the MSA.
What you need to do is phone the MSA on 01753 765050, tell them your name and your National-A license number and that you are racing at SPA in October, and that you would like the MSA to provide you with the necessary letter of authorization - they will e-mail it to you almost immediately. Then just remember to print it and take it with you!
Cheers
Trevor