Good news for those that mess about on rivers, canals, lakes, lochs, etc. I have just added Weirs, Lock Gates, Boatyards and Slipways to the map style.
For hikers, etc. I have also added Waterfalls and Ditches (where that data is in OSM and tagged correctly).
Some screen shots below:
This latest style will be used in ALL TT50 style maps starting from 30th of May, 2020!