Yes, I agree, it is quite worrying that even some comparatively recently produced publications still give out this sort of information. Although, having said that, hedgehogs may be partial to milk, but, even the best of us probably are partial to things which are not good for us. We are capable of making an informed choice – to hedgehogs it is probably just food, so they would probably drink it if offered. Likewise, I come across people who still think bread and milk are an ok thing to give to hogs. There is still work to do before the general public know that hedgehogs are lactose intolerant.
Glad to hear the hogs there are enjoying the feast you are providing. I think it is ok to give a few mealworms, although, I must admit, when I first found out about it, I thought I would cut them out completely. Now I tend to give them a very small ‘garnish’ of mealworms with their meal. I will probably cut this out when hoglet time arrives.