I'll probably get jumped on here, but I still think the military circuit join through initials has a lot to be said for it.
Incidentally I was very grateful that Compton Abbas still has a signals square this morning, as I was having radio problems. Joining overhead and looking a the signals square potentially saved me from a mid-air if there had been other traffic at the time (which there wasn't!).
If you run an airfield with a signals square and are contemplating getting rid of it - please don't!
Tim