If you got 150km before you had issues, I would say that the headgasket was not blown at that stage but there were issues with cooling issues and by continuing on (and this is not a criticism) brought the issues on big time the next time around and cause the head gasket to fail.
Clearly there was a cooling system issue as for "normal" coolant top ups you would to this through the reservoir and not the radiator itself which would need bleeding.
I feel your pain - as both a Canberran and a Novocastrian (just back from Newcastle last night) I would definitely get the vehicle taken to Newcastle or even to Coopers or Davis Performance Landies in Sydney - I really could not recommend any cost effective repairers in Canberra.
Cheers and good luck with it.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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