We have two hedgehog boxes in the garden and until recently, we had 3 hedgehogs visiting. They like mealworm, crushed nuts and sunflower seeds. I wouldn't recommend cat food (they prefer dog food anyway) as it does attract foxes and foxes will attack hedgehogs. Plenty of water too, ours drink a lot of water. We put up new fences this year and they lost their gaps, so we cut out a hedgehog gap in the gate and they soon learned to use that instead
Good luck next year Ian, I hope you get some in the garden! There is something lovely about a hedgehog, esp when they get used to you being around. I've topped up their food on their plates and they just got to the stage where they didn't run away at all.