I am surprised that Spikes are making hog food with dried bananas in it. I always thought they were an ok make, although I don’t use their food myself. I wonder whether these strange ingredients are being put in hedgehog food because of the hedgehogs (non European) which are kept as pets these days(?). I don’t think there is any guarantee that the new food would be any more nutritious than cat/kitten biscuits, so I would go back to cat/kitten biscuits if the hogs like them anyway. Maybe try to use it up – maybe the birds will eat some of it?
At the same time try to improve the habitat in your garden for the hedgehogs. If they can catch their own wild food, it will be better for them than any of these things we are offering to them! Good luck.