N. France Aire recommendation

[Willgr]

Hi,
Can anyone recommend a safe overnight stop (ideally free) in northern France - probably somewhere between Calais and Saint Quentin with easy access from the A26? I plan to arrive after 10pm and get on the road again early next day - so it doesn't really need any facilities or a nice view - just need a decent night's sleep!
Many thanks!

 

[fantasque]

Check out Campingcarpark.com and park4night.com should find a site.