London / Marriott Maida Vale / OPEN (may be closed on holidays); Lounge is open for breakfast on weekends & key accessible, but no evening snacks Fri-Sat; 10/06/12 update
This is still correct as of November 2013.
Breakfast from 06:30 to 10:30 (Monday to Sunday)
Afternoon tea 15:00 - 17:30 (Monday to Sunday)
Canapes and alcoholoc drinks 18:00 - 20:00 (Sunday to Thursday)
Beverages available all day