There's always the TG lounge in T1 which is open up to the last TG departure at 9pm. It's usually relatively peaceful, and the decor is such that it is quiet. Much maligned lounge, it is dark and carpety, but whenever I've been there very quiet (the decor helps absorb sound I think) and relaxing. An options for those departing from higher B gates and C gates who don't need anything flashy.