Blocking footpath on my property used by people to walk on my garden

[Deleted User]

Doesn’t really help you but I suffered something similar, years ago. Not my property, a rental, but it irritated me. Rather than people, I had cars short-cutting across the top of my drive and border to get to theirs. For them, an easier turn (not having to slow down to take the corner, instead). For me, putting back the displaced gravel; mud where the layer underneath had torn. I knew it only happened because there was nothing in the way preventing it. Were the property mine, I would have extended the fence as far as the deeds allowed (I checked them to make sure I wasn’t just getting annoyed for no reason). Someone else’s problem, now.

propertyrental

Is the path a 'Public Footpath'? Check with local council/ordnance survey etc.
Do your deeds have covenants granting specific people a Right of Access?
Do the deeds of any of the other properties have covenants granting them a ROA?

ProDave

Does the path end where your blue line ends as it crosses your red boundary, and people are walking over your grass to continue their journey?

Or does the path continue and they are walking on a path without even knowing ownership of it has changed?

A photo might make it clearer.

mi-key

Maybe put some box hedge along that last bit?  Should stop people and also look a bit nicer?