Mrs Monk and I used the CCR for the first time last month and we both prefer the F lounge at T1. Thought that keeping out the run of the mill Golds would make it more exclusive, but we found it relatively busy and not terribly special.
The T1 lounge has a much better feeling of space and light, while the CCR seems like it was designed in the 70s. You might have thought that BA could afford a better brand of champagne for Fs only, but no, there was only the familiar Cazenove and Blue Top, and service was somewhat slower than T1.