Right or wrong (and most of us think it's wrong), Le Merigot is considered a resort & exempt. It's a hotel on a beach; no resort about it. There's a long thread on Le Merigot in this forum.
LHR Ren is open 24/7 w/ room key. As others have stated re: some other properties, only soda, coffee, tea available during the weekend, and after hours during the week, but it is nice to have access to the lounge (and at that property the free i-net terminal).
Hadn't thought about it much, but I like the idea of lounges being open 24/7 with room key. Everything's usually locked up - and in the case of Grosvenor House all the booze is removed from the lounge each night before lock-up.
Cheers.