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Here are a few to start you off

http://www.campingcheque.co.uk/france/picardy/  and you can book your ferry through them as well.    Some of the sites will accept camping cheques for 28th August onwards e.g  La Ferme des Aules and Le Val D'Authie. 

Use Camping Cheques or an ACSI Card in France (www.campingcheque.co.uk or www.campingcard.co.uk) and you could pay between 11 and 15 euros for a night on site for two people, pitch, car and caravan (or tent) or motorhome, awning, and electric hook-up.  With ACSI the two under sixes would be free on some sites - look for the sites with a group of children - as three under sixes are included in the 11 to 15 euros.  Look through the websites, and then if you see anything you like come back on here for opinions.

Personally I'd go for somewhere with a decent indoor pool and plenty of organised activities for the children.  You could do with being nearish to a beach - so that if the weather is stunning then you could do the beach - or somewhere inland with other activities, such as Lac d'Orient (see campsite search on this website) in the Champagne/Ardennes region (visits to Champagne Producers possibly organised by the site) - great sanitary blocks, lakeside beach - not a lot within walking distance, but if you find plenty to do on site you might not want many trips out.

If you have Tesco vouchers put them towards deals, and use them towards your Eurotunnel crossing, otherwise try Norfolk Lines and P and O who both have some summer offers.  I can't remember details, but for a car the prices seemed pretty good.

I'm sure others will have plenty of suggestions.