@bloodywhitecat could you just water your garden, if you haven’t already, to encourage insects to surface?
i checked on hedgehog street and the recommendation is exactly what you have been doing I.e high meat content wet or dry pet food. It doesn’t suggest anything else.
What can I feed hedgehogs?
Hedgehogs will relish any combination of meat-based wet dog or cat foods, or dry cat/kitten food, as these are high in the protein that they need. Just remember, they will be getting most of their food from insects and worms in the wild, and this food is only supplementary.
Place in a shallow dish and put in a sheltered area of your garden, or a feeding station (see below), around sunset. Splitting food over several sites may reduce aggression at food bowls. Don’t forget to offer water bowls too!
Specially made hedgehog foods both in dry and moist kibble varieties exist and can be bought from most local pet and garden stores. Please note that these specialist foods are not regulated or approved, and those resembling pet food with a high meat content are most suitable.