Well thanks to this forum I have recovered very quickly from an algae bloom this week.
The Fc of my pool was a bit below the recommended 4-8 (maybe 3.5) at the time of the rain event (about 35mm) and I was away from home for a few days. When I returned home on Monday afternoon I took off the cover to find that the pool was green. I had just got my Taylor K-2006 kit last week form a pool store in the US ($35 cheaper than the "local" supplier even with postage included ($35)) The "local" supplier is about 1500 miles north of Melbourne so not really that local.
Back to the plot.
Turned off the SWG, checked the PH (7.5) brought the FC up to 35 with Dichlor, left the pump running 24/7 and rechecked and adjusted the FC back to 35 every couple of daylight hours. Its now wednedsay evening and the pool is almost crystal clear again. I have brought the FC up to 35 again and will retest in the morning if it is still between 34 and 35 I think I am done and will let the FC drop back down to about 6.
Last test results
FC 19 (added Dichlor to get it back to 35)
CA 140 (a bit too low should be 260 from PoolMath) I will fix this on the weekend.
I am a new pool owner so still learning, but this site has helped me a huge amount in sorting out this little episode.
Thanks to all who have posted their wisdom here.