Hi Jon

Again thanks for the feedback, but my re-reading of the Openstreet map link provided makes me think it should indeed be "designated", rather than "yes"

My reasoning;
The OpenStreet link re. designated says;
"designated ways are intended to be usable for the designated purpose(s). If real world usability does not match designation the ways should be still tagged as designated with additional tags such as for example smoothness=horrible to describe the real world (un)usability"

Pudding Lane is categorised by the local Council as a "Byway open to all traffic", reference for this is the Wokingham Council's interactive map, link here;
https://experience.arcgis.com/experience/693aa0ab35dd45e7ae8e256533d7dd2b/#data_s=id%3AdataSource_1-18b03eb066f-layer-133-18b03ea48fb-layer-126%3A21
(will need to zoom in)

The "Byway open to all traffic"  (aka BOAT) is defined as "A highway over which the public is entitled to travel on foot, horseback or pedal cycle and by wheeled vehicles of all kinds, including mechanically propelled vehicles, but which is used by the public mainly for walking or for riding"

The "mechanically propelled vehicles" part of the BOAT definittion makes me see this as motor_vehicle=designated.

Even though Pudding Lane is likly impassible for four wheel vehicles due to their width, but they are specifically entitled to use it. So real world use does not match the Councils descritpion. So an additional tag of smoothness=veri_horrible seems about right.

I hope you'll consider my above proposal and clarify for me if its not aceptable.

Thank you in advnace
Al