Getting there - I've found the trains are perfectly fine. From East Croydon > Clapham Junction > Barnes (or Barnes Bridge), then either walk or catch a bus to the entrance road for the Wetland Centre.
Is anyone interested?
I suggest we arrive for opening at 9.30am and I personally will need to be back in Croydon about 4pm, the park stays open until 5pm.
Depending on how people are willing to travel, I suggest we either meet in the entrance area for E.Croydon station at 8am or as a final group just inside the centre itself. I also like to treat myself to breakfast from the nearby Pret a Manger beside E.Croydon station so if people want me to do a bulk croissant order, I can set up a list

Anyone interested please let me know - I'll shout it out on this coming Wednesday too.
In terms of gear, I recommend the longest telephotos you have available, plus macro lenses in case you like chasing dragonfly

I enjoyed watching the otters for literally hours!