'Rustic, regional European dishes made from fresh local ingredients... 80 handpicked wines'. On the top floor of the museum, this rather classy venue has an outdoor rooftop terrace (highly enjoyable on a hot day but rather exposed in inclement weather). It's always busy, and it's definitely worth booking in advance (although if it's full you can always go down to the comfortably proletarian café in the basement). Dress is usually smart-casual and there's rarely a toddler in sight.
The Dining Room can be hired outside museum opening hours, and will take up to 100 people for a drinks reception, 70 for a seated dinner and 80 for an informal buffet.