like-minded clientele
That clearly doesn't apply to the Civil Servants I work with who frankly frankly would struggle in a recce test to differentiate between a carrier pigeon and a C-130.
But being slightly less flippant, how many of the CS working in Defence actually associate themselves with Defence and how many view what they do as just a job i.e. as long as the pay cheque comes in each month it doesn't matter whether its MOD or some QUANGO?
It might appeal to those who come up to London relatively infrequently but need a bed down location for a day or 2, but I would then have to ask why would they go to the RAF Club when they have their own Civil Service Club in Whitehall with lower membership fees?