Flying into LHR in F, arriving on a Saturday afternoon. Then departing for PRG the next morning. There are flights I could talk b/w Saturday afternoon and Sunday morning, but I want to stay in London for the night. Also, the LHR - PRG ticket will be not be under the same PNR as the F ticket to LHR.

Question: Is Concorde Room access permitted on the next day? It seems like it would be pushing it to ask for access, but perhaps the rules allow it?

PS -- I feel like this question has been asked and answered, but I searched for 30 minutes, and couldn't find anything.

Thanks.