UK has the concept of public footpaths (actually, it would need to be a bridalway to legally cycle on it, rather than just walk) that allow public access across private property.
Ironic given the whole “Englishman’s home is his castle” compared to the absolute priority of private property rights here in the US.
TL:DR Absolutely ok to cross private property as long as you stick to the path as marked on the map. Landowners do not always help, and therefore lock gates, electrify fences, block stiles, etc. Perfectly legal to circumvent these illegal barriers.
