Hi Annabel, yes I've been to Slimbridge a few times and it a great place. Like you I don't live close so my visits are usually restricted to when I visit relatives who live in Gloucestershire.
Although it's quite interesting to see the exotic captive water fowl I prefer the wild birds out in the estuary and surrounding meadows.
My last visit was just before last Christmas. It was only for an afternoon but it was worthwhile especially seeing the Cranes and also the feeding of the Bewick's and ducks at sunset. I did a trip report HERE if you are interested.
As you've started this thread why not post your pictures here. I'm sure people would like to see them.
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Tony
My Flickr Photostream