Some distance away, I know, but I lived in Marlow, Bucks, on the Thames till the early 1960s, and there were various small streams running into the river that were navigable for quite some distance, leading to posh houses with boathouses. In fact, the Abbotsbrook estate in Bourne End even had a skiff lock on it. See https://commons.wikimedia.org/wiki/File:Repair_work_on_the_smallest_lock_-_Abbotsbrook_Estate_-_geograph.org.uk_-_302159.jpg and https://www.ebay.co.uk/itm/322976811390 (which incorrectly says Bourne End, Herts instead of Bucks,)