Maps showing fences ?

I don't remember seeing gates but have often confused fences with things like power lines.

Anyway the legend/key is here if that helps identify what line is meant to be what.  Of course all subject to whatever the local contributor(s) specified when they edited the map.

https://wiki.openstreetmap.org/wiki/OpenStreetMap_Carto/Lines#Barriers

all subject to whatever the local contributor(s)

This. I occasionally add fences/gates where I think they'd be important or have changed. Difficult to do for a large area though if you want any sort of accuracy. Even just adding what you can see is hard enough. I'm not about to walk miles of estate/forest/enclosure boundaries.

https://wtp2.appspot.com/wheresthepath.htm will show you an OS or OSM map next to an aerial view. Handy for terrain but should give a good idea of fences and gates

https://wtp2.appspot.com/wheresthepath.htm  will show you an OS map next to an aerial view.

Thanks nickjb - I'd forgotten about that site. Coupled with Strava heatmap I can work out a route across the hills...

https://www.strava.com/maps/global-heatmap?sport=All&style=hybrid&terrain=false&labels=true&poi=true&cPhotos=true&gColor=blue&gOpacity=100#14/56.1678/-3.83359

cycle.travel uses OSM for routing. The background map default can be changed to OSM which does shoe boundaries, gates, etc. BUT... OSM depends on the accuracy of the person who has submitted the data. It can be somewhat iffy.

cycle.travel uses OSM for routing.

Thanks. I use cycle.travel for planning road / gravel routes but find it seriously lacking for the hike-a-bike mountain biking I do.

Bikehike is another one I use - Google imagery side-side with OS mapping.

Pretty sure OS Maps show boundries.

You can turn the OS layer on when using Bing Maps on a desktop.

1:25,000 scale os maps show fences, and other boundaries. As above, look on Bing maps to view this for free.