There is a average rated French restaurant called The Rice Boat located by the river, where you can eat for less than £20 per head.  You'll find it near the Express by Holiday Inn.  It isn't family-friendly.
[['The Rice Boat', 'eatType', 'restaurant'], ['The Rice Boat', 'food', 'French'], ['The Rice Boat', 'priceRange', 'less than £20'], ['The Rice Boat', 'customer rating', 'average'], ['The Rice Boat', 'area', 'riverside'], ['The Rice Boat', 'familyFriendly', 'no'], ['The Rice Boat', 'near', 'Express by Holiday Inn']]