Don't rule out evening Eurostar trains to Lille or Paris. Tickets are often cheaper and, despite the clocks being an hour ahead, your break can still start that night, as there's plenty of accommodation near the Eurostar terminals and good restaurants that stay open late.
For example, microbrewery Les Trois Brasseurs (22 Place de la Gare, Lille) has cheap-and-cheerful local dishes, while you might also try the art deco Brasserie Terminus Nord (23 Rue de Dunkerque, Paris).
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