Oh Pete, I do so love seeing swans. We live near a chain of lakes and small rivers, so water fowl are all around. The honking of wild geese and ducks is such an evocative sound at early dawn.
I buy large packs of lard (very cheap), melt some and throw in any scraps, a few porridge oats, catfood leavings, bits of fat, dried fruit, crumbs etc. I then pour it into small aluminium cases (like those you get takeaways in) They go in the fridge until hard, then my husband puts one in the feeder every two or three days days. I then refill the cases. I put sunflower hearts in a special feeder for the goldfinches and tits. We put scraps on the ground too for other kinds of birds. I know it encourages rats etc but I reckon my three Siamese will see to that. Funnily enough (thank goodness) they don't chase the birds here as they did in my last house, probably because there's no cover for them to hide and stalk.