Welcome to Rum Ration, ktantam.
I can't offer personal experience of the Churchill Estate, but I can tell you that the Faslane HIVE is very helpful, if you need to speak to someone actually local to there. You can reach the HIVE at Faslane on 01436 678 029 - it's open from 0800 - 1530 Monday - Thursday, 0800 - 1500 on Fridays.
There is, by the way, a parallel website to Rum Ration called Rear Party; there is at least one thread on there about Helensburgh; some of the women who have contributed to it are living there at the moment, so they may be a good source of support for you:
Navy Family quarters