Probably saw that same Kingfisher today. I had a meeting arranged at New Mills Yard and while standing above the sluice waiting for somebody to arrive it flew out from the bank. Nice to see that there are still Kingfishers in the centre of Norwich!
Yes indeed, we don't do too badly really. I used to see one (and Grey Wagtail) fairly regularly near Cow Tower, so there are probably a couple of pairs in the city.