This plant appears to have come into my place with a big load of soil I bought. All sorts of weeds have come up in it and most I just putted out. I left some very small leguminous vines and Ipomoeas. This one however started to become giant sized and I have no idea what it is. The leaves are rather pumpkin-like but a bit smaller and not so hairy.
The stem of the vine is ribbed like Winged Yam (Dioscorea alata) but also twisted.
This is the growing tip of the vine and a newly forming leaf which looks typically like an Ipomoea.
This looks like flowers developing.
More developing
There aren't any fully developed flowers yet, but hopefully I'll get photos of some this weekend and post them here.
I don't think it's a native, haven't seen anything local like it before. Hopefully someone here might recognise it, thanks.