Hi again Lou
( ... my "still looking" got interrupted by dinner

)
Yes, had since found Janet, relict of Isaac McEWAN, buried at Symonds Street Cemetery ... so realised re-marriage was not in the frame.
Have searched high and low and can't see anything that might have resulted in Agnes marrying in 1870 using the surname of BURNS.
Incidentally, the resource I viewed (NZSG Marriages) records the event as >
Agnes Mary BURNS - Edward
SHATLOCK - 1870
It's interesting that the marriage cert. shows Agnes as being a few years older than her bridegroom (age 25) ?
Did Mother maybe object to this union ?? Has Agnes has gone ahead regardless - using an assumed name and different age ? (Agnes would have required permission to marry only if under the age of 21 .)
And, if "years in VIC" on d/c's is correct, then the couple seem to have headed to OZ very soon after marriage ?
Mmm ?
~ Lu