... I'm trying to find out more about the drive around Brussels on a Saturday. Really need to cover 400 miles that day and struggling to find a reasonable overnight stop off point en-route
You could go via Eindhoven and [font="arial, helvetica, sans-serif;"]Liè[/font]ge to avoid Brussels.
For en route stopover, have a look at Langres in Champagne-Ardennes on Booking.com. I found:
Motel San Michel
£43 for a double room. 709km, 443 miles, 6h 53m (Google maps) from Zandvoort via [font="arial, helvetica, sans-serif;"]Liège[/font].
It looks like they are used to UK registered sports cars - pictures show Ferraris, a Lambo, TVRs...