Hi, Lozza,
Don't know how much relevance my high-alpine suet cakes will have to your birds there, but we get snow and cold weather for several months, so perhaps it'll work. This "recipe" makes enough mix to fill two 9" x 9" x 2" cake pans, which is the right size to fit into the commercial suet feeders sold here.
8-10 pounds of beef fat trimmings from a local butcher; "render" (melt) it over several hours; strain to remove all but the tiniest bits. (My butcher gives the fat away since it's not for human consumption.)
5 pounds of any mostly shelled seed mix that has a majority of sunflower hearts; I use something called "Nut n' Berry" by 3-D Pet Products (at WalMart) that contains sunflower kernels, shelled peanuts, small whole sunflower seeds, whole safflower seed, tree nuts (either pistachios, almonds, walnuts, pecans or filberts), hulled pumpkin seeds, dried raisins and dried cranberries.
1 pound of any "gourmet mix" of smaller seeds (niger, millet, etc.)
Handful of corn meal
Sometimes add peanut butter if I end up with less fat than needed.
While fat is hot, pour over seeds in a large mixing bowl and mix quickly together or fat will start setting up. During the winter, when the seed bags have been stored on the back porch and are cold, I toss them into the microwave first to warm them up before mixing with the fat.
Line cake pans with plastic wrap. Our plastic wrap (Glad brand) is wide enough that it comes up both sides, but you also want it long enough to completely cover and overlap the top when pan is filled (about 3' long per pan). Press the mixture very firmly into the pan, getting into all corners, and when pan is full, fold the ends of plastic over top and use your flat hands and body weight to further compress the "cakes."
Put in freezer until needed. The plastic wrap not only keeps this greasy goo from touching anything else, but it just falls out of the pan when you pull it out to refill your feeder. Unpeel it as you slide it into the feeder making sure not to leave even the slightest bit of plastic behind (sometimes on the corners I've had to chip away a couple of seeds because the plastic would get bunched up a bit). Caution: Don't "thaw" the cake before peeling and inserting it into feeder; it'll crumble into the messiest, greasiest disaster you'll ever deal with!
I imagine if you wanted to make "balls" instead of using a mold like I do, all you'd have to do is invest in a box of latex gloves, invite the neighborhood kids over, and have a "ball" making winter bird food!
Our woodpeckers, titmice, chickadees (tits) and even the jays who try to pretend to be woodpeckers by clinging to the side of the tree absolutely love these cakes. I usually have to put a new one out every few days; or every day if we get inundated with pinyon jays who descend on the yard in flocks of 40-100 at a time.
And to discourage the squirrels from parking their furry little selves on top for hours at a time, I replaced the wood sliding lid with a metal license plate and angled it just enough so the heavier squirrels can't get enough purchase to sit or cling, but the birds can. I don't mind if the squirrels come up the tree and hang for a few minutes at a time from below and munch because the birds can get to the suet from above and behind. But the birds won't come near the feeder with a squirrel parked on top.
Good luck! I'll watch this thread to see what other people use for suet cakes/balls as well since I'm sure the birds like a bit of variety just like we do!