What you apologising for Phil? I'm just sorry no-one has answered your query as yet.
It's a long time since I've been there, but Walney Island
may be good. I remember going there once and we spent a very enjoyable couple of hours.
There's a variety of habitats including fresh and brackish water pools. You can zoom in on that map from the controls on the right to get a more detailed map. I remember there was at least 1 hide, what what condition they're in now after winter weather, I couldn't say.
There's another reserve at Hodbarrow
, which came recommended, but we didn't manage to get there sadly.
Depending on tides, you should get some wintering wildfowl there, or anywhere along the coast.
Hope these ideas help.