Quite,
the Thames is pretty hard work these days... so many regulars when it is busy, and sometimes virtually nothing at all for hours on end before a 'regular' turns up and that's your lot.
I respect your restraint in not re-posting those regular visitors, something which many are guilty of. But then again with the search engine being such a slow, inadequate and cumbersome thing to use on this site a bit of leniency has to be allowed for.
There are some interesting arrivals, but you need to have all the time in the world to wait around for those lucky moments.
Ho hum!

John J.