I just took a look at www.mapmyrun.com which is a site I use quite a lot when I'm at home. Imagine my surprise tonight when I discovered that it works in Australia too and I could map the run I have been taking most mornings since I got here last week.
I had estimated the distance at 4.5 to 5 miles and now know it is 4.86 miles.
Tomorrow will be my last run, as we leave for the good old USA on Thursday morning, but on future trips overseas I'll remember to check in with manpmyrun.com earlier.