I guess I just hear it said that canberra is cliquey when I don't find it that way at all, you just might need to go out and seek ways to meet people. I make new friends every year and not just through my kids, or through people I know but through volunteering, trying something new, going to an event etc.
I think canberra has a lot of new folk at the beginning of every year and on the Canberra Mums page you'll often see people wanting to meet up/start a walking group/have a play date and not just for people with one baby. I've also found canberra to be a place where mums will absolutely help other mums out. Hell, one time I went to buy something off gum tree and the mum was so lovely I ended up chatting to her and my toddler ran off to play with her girl and took a liking to her, and she invited to stay for a cup of tea and then we ended up meeting up for park playdate. along with stand offish people there are always lovely folk to be found, I guess like anywhere new you just have to be brave and put yourself out there. Which is exactly what you are doing Rose