Hi Lilburne and a warm welcome from me too.
I've not been able to observe Hen Harrier pairs too often. But I believe the pair will, in early spring, fly together. The male will catch a prey item and will pass it over in flight. The male drops the item and she catches it. This is all part of their pair bonding and a necessary skill for when there are young to feed.
The male isn't allowed on the nest, but when he calls she goes up to meet him and they do the food pass.
I'm sure you will enjoy it here and I hope to hear about all the birds you see when out and about.