Set a route from Ettington to Burton Dassett Country Park, both in South Warwickshire. The suggested route takes you right through a heavily guarded MOD site: an armaments location and barracks. Entry is, of course, prohibited. It is very easy to make the journey on public roads.
Thanks for spotting that! The roads weren’t marked as private access in OpenStreetMap, which is what cycle.travel uses as its base map data. I’ve fixed that and it’ll show in cycle.travel when it takes an OSM update in a week or two.