Hello, only just seen this; I fear I've just undone your work again, certainly not my intention to get into an edit war. Please accept my apologies.

That said, is this really common practice on UK waterways? OSM wiki suggests not:

>The tag is also used to indicate if a river is practically navigable or not for boats, however, this is ambiguous, as it does not provide any information about the boat types for which this is valid. Access limitations can however also be constituted by legislation which might refer to on-the-ground factors factors such as date, water level, or damage to the surroundings caused by using the waterway.

I can certainly think of situations and routes where one might tag boat=yes, motorboat=no (for example, a dinghy with outboard motor can manage, but a narrowboat or widebeam cruiser isn't maneuverable enough - such as the River Severn east and west channels above the Lower Parting through Gloucester, which has a legal right of navigation, but is a bit overgrown due to low use).

Welcome your thoughts. Thank you!