I wonder whether under our current law if a same sex couple married in the UK or Canada or the USA or NZ applied to migrate here as a couple or as a family would they be recognised as already married or not.
No.
To be recognised they generally have to conform with current Australian Law.
88EA Certain unions are not marriages
A union solemnised in a foreign country between:
(a) a man and another man; or
(b) a woman and another woman;
must not be recognised as a marriage in Australia.
