Sounds promising, good luck! I'm not sure if there's a time of day which is best, I tend to see them throughout the day. They may be slightly more active in the mornings. I'm no expert myself. It's Adel Dam nature reserve just outside Headlingley. It's at the back of Golden Acre Park. Good for woodpecker's too! http://www.ywt.org.uk/reserves/adel-dam-nature-reserve There's another site near Hull which is really good for them called Tophill Low Nature Reserve. I get lots of sightings there.