options for a quiet, low-key, late-night Continental/British/French/Italian meal (after 10:30 pm), within a 10 minute taxi of Green Park....

[prima]

Here are some restaurants that came up through opentable:

Caffe Concerto

Chabrot

Bistrot d'Amis

La Brasserie

La Brasserie Mayfair

Grace Bar

Which of these places should I avoid? La Brasserie Mayfair had fairly negative reviews on opentable.

Just looking for a light meal. Decent food with reasonably good service is good enough for this one.

What other places should I consider?

[prima]

Thanks for all your recs. Turns out, I wasn't able to head out for dinner until 11:15 pm, on a Sunday, and it seems most restaurants that are open late Mon-Sat aren't open quite as late on Sundays. Most restaurants in Picadilly were closed or closing as we walked by just after 11 pm.

The Wolseley website had a closing time of 11 pm on Sundays on the website, so we trekked towards Leicester Sq, and stopped at the first non-chain (Fiori) that was still busy at 11:30 pm on a Sunday. Fiori was ok for a couple 3 GBP sandwiches at midnight. 2 sandwiches and 2 beverages came to around 11 GBP so I'm not going to be too critical about the food or service. Most people seemed to be eating pizzas and jacket potatoes. The average age of their clientele was somewhere around 22.

When I breakfasted at the Wolseley a couple days later, it appears to be open til midnight each night, according to its sign, rather than until midnight Mon-Sat, and until 11 pm on Sundays. If I was hoping to eat near Mayfair after 11 pm on a Sunday in the future, I'd head to the Wolseley first, before trekking towards Leicester Sq.

The St. John Hotel would also likely be open at this time on a Sunday night, but I was looking to spend less than 25 GBP per person.

[prima]

Thanks for the recs & comments, Scruffy The Cat and greedygirl. Have added your restos to my list. ;-)

Turns out the Wolseley is also open until 11 Sundays, and until midnight the other nights.

[greedygirl]

Chabrot Bistrot des Amis is supposed to be good. Never heard of any of the others.

I'd also consider Terroirs and Les Deux Salons - both are close to St Martin in the Fields.

[Scruffy The Cat]

I liked Les Deux Salons though it wasn't nearly as low key as Caldesi. It was very loud and bustling. Then again, we went at 8 vs 10:30. The food was excellent, however.

[brokentelephone]

I second LDS - it shouldnt be too noisy at 10:30pm

[Scruffy The Cat]

How about Caffé Caldesi on Marylebone Lane? It's low-key, pleasant Tuscan food and they are open until 11.

-----
Caffé Caldesi
118 Marylebone Ln, Paddington, England W1U 2, GB