Make sure it's open, I was up in July and drove 30 miles to find it had been closed for a few months, Their website isn't very clear, they have been doing a lot of work there and have had to close it for a while. If it's open, it's great, I visited previously just as we came out of lockdown. The main reservoirs were full of wildfowl, nothing interesting, but the woods, marshes and scrapes were good, and the hides were ok. If you're in the area Skerne Wetlands is not far away, I think it's a Yorkshire Wildlife trust place, not easy to find though.