How much spending money does a couple need for a trip to France?

We will be travelling to France in July (5 days in Limoges for a wedding). We are adding three days in London. Aside from lodging and travel (already paid), how much USD should we plan on bringing for spending on food and incidentals.

Best reply by hollister chick:

Bring money for shopping and good resturaunts

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How much spending money does a couple need for a trip to France?