I did the same, came near to expiry date I changed from retirement O based on income to marriage based on deposit.
[I had the 400k deposited for the previous 12 months]
I was given a 30 day under consideration stamp and had to do a "full application process" as apposed to ext'n.
Did the required paperwork dual copies of everything and had the home visit. Stamped and approved at the end of the 30 days.
Next year I guess getting an ext'n will be slightly different but in what way I'm not sure.