The sooner you stop converting everything back into pounds the better. You live in Australia and earn Aussie Dollars. It doesn't matter what the exchange rate is as it has no effect on your shop at Coles or Woolies.
If the exchange rate was 1.9 like it was just a couple of years ago your shopping would appear to be cheaper in Oz when in fact it isn't as it still costs you $112 regardless of the exchange rate.
By all means take advantage of the super strong dollar by buying things from the UK or US but the sooner you start thinking in dollars the saner you'll be.