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I have heard something like the limit for an Aussie without a visa in the UK is 6 months stay within any 12 months time-frame but I'm not sure if this is true?
It's not true. Normally when entering without a visa for tourism or business, you get a 6-month leave, and technically there's no limit as to how many such admssions periods you can get within a certain timeframe.
However, if the officers suspect you're trying to live in the UK through visa runs, or perform an activity that requires a visa, they'll either give you a shorter leave to enter or refuse you entry.
If you stayed for several months and are returning less than a couple of months later, expect to be interrogated. In this case, bring every single piece of evidence of ties to Australia, to present on request