I bloody love Wildhive, if you want to impress someone, bring them here. The food is amazing, the scenery is brill, and Callow Hall itself is like walking through a National Trust property and going for a drink.
Speaking of, the Old Fashioned here is unreal, I've not been able to have another one since without comparing it to the one I had at Wildhive. I brought my mum here for mothers day/her birthday and we had the full 3 courses and drinks, everything was ridiculously good - but, it does come with a hefty price tag.
We had the 3 courses, and 2 drinks, and it came to (after the service charge) around £200. Which I get is expensive, but if it's a one-off occasion, or if you're just fucking minted, it's something that you won't forget.
They do grill nights as well, which are well worth going to where there's a slightly different menu, the menu also rotates with the season and loads of the ingredients are grown fairly locally too (I had some Kale from Eyam when I last went).
Overall, a really really special place, you can stay here too in treehouses and there are rooms in the hall itself, well worth going if you can.