Yes, the lounge closes after the BA98 leaves - last night this was well after 9pm.. normally, should be before 9pm (scheduled dep is 2050).
Update part 2: Food not so good. Ordered from the menu in the F dining area.. both courses well over-cooked, including a rather chewy salmon! Buffet area in Club side had more choice certainly, but the 'hot bits' again looked a tad cremated!