Cost of living in Australia - Grocery shopping

Like many others, it has been highlighted to us that the cost of living in Australia is way more than in London. Is this really the case?!  We have looked into this and are trying to figure out what our monthly budget will look like.  Having completed our weekly food shop online, Mrs Wandy McNoble added the same items (as close as possible) online at http://www.coles.com.au/.  She found the same shop to be only £2 more expensive in Australia.  This may be a one off, so we intend to do the same again next week.  It is pleasing though :-)

Mr Wandy McNoble