Well we are supposed to be classless here in Oz, but it ain't necessarily so. Accent doesn't really count, but area of abode is of the utmost importance, and how we eat our food and educate our kids.
Food
Middle class - home cooked meal around the table.
Working class - sometimes home cooked, often nuked freezer food in front of the telly.
Abode
Middle class - Huge brick monstrosity in a leafy suburb, or a classical colonial style home in a posh suburb, or a posh inner city flat.
Working class - flat, small house, or commission (council) house in a dodgy suburb with industry nearby.
Education
Middle class - private school then university
Working class - state school then apprenticeship OR university (because everyone who qualifies can afford to go: we have Austudy, similar to a student grant, and deferred fees repayable in the form of extra tax, if and when they earn enough)
We are a mixture of middle and working class - well, most people are: the borders are blurred. In fact in our family, one son sounds very posh and teaches at a private school, the other son sounds very Australian and has left the white collar job he got after getting his BSc, and has taken on an apprenticeship to be an electrician.
We ( DH and I) are tertiary educated, broad Yorkshire speaking lefties in a commission (council) house, who listen to classical music and eat home cooked food at the table. Gawd knows what that makes us.