Add latch to metal gate

[Goku]

Hi,

I've had this gate for years, but it doesn't have anywhere to add a latch to it. Any ideas on what I could buy or do to make this close? Currently, it swings open onto the pavement.

I don't mind adding batons or other helpful devices to to the side walls (as long as they don't look hideous) and I don't mind changing the existing latch part which is on the side wall.

p.s: I know the existing wooden baton needs changing as it's rotten

 

[Tigercubrider]

you could add batons to the walls, with the opening side bigger so it stops the gate swinging past the boundary.
If you have access to a welder, add a new edge with latch.
If no welder, then heating a metal bar to fold two ends over would allow you to drill and bolt something on.