I want to get a dog but I have to work, how does everyone on broadway market do it ?

there’s a golden retriever in that pond easing five ducks

Teasing? Eating? Rearing?

You're in a battle with millions of years of evolution. I think you either accept it as the natural order of things and hope your dog is dumb as a stump and has no chance of catching wildlife or keep her on a lead all the time.

Is Bailey a swimmer in general? Crumpet was always a bit nervous of water when she was younger but loves a swim now. We encouraged her to come and paddle about with us when we were at the beach one day and I think it showed her that it was alright.
She doesn't really chase the ducks in Crystal Palace Park but does sort of bob about with them, the extent of her athletic ability.
Hopefully the Egyptian geese have their little ones there again this year!

When training Ada it's been 99% positive reinforcement. The 1% I've saved for extreme situations like when she tried to chase sheep and I didn't have a good enough hold of the long line. Which was a stressful couple of minutes. After that I deliberately sought out sheep (with her on the lead) and very very firmly told her off whenever she showed the slightest interest in them. Like even looking at them for more than a second or two. I think I could pretty confidently walk her through a field of sheep now without stressing. Though would have her on lead anyway.
She's shown relatively little interest in ducks, but would do something similar if I thought there was a risk.
Of course she's not really wired for hunting so this is possibly irrelevant to you. All the sighthound people I know have gps trackers for when they disappear after a squirrel ...

They should build a pub next to it called the Dog and Ducks.