I wonder what Ilford has to say about this alleged latent image issue with Pan F. I use "alleged" for quasi legal reasons as I don't think there is any incontrovertible proof to date.
As others have said I seriously doubt that it misbehaves when being processed. I have used it only once when my ignorance of film in general was bliss and didn't see a problem when I processed it.
Indeed if there was a proven issue on latent image you'd think that Ilford would have mentioned it. I can't be the only photographer not to process for several months so if I were ever to use Pan F again it would be helpful to know what the maximum time it can be left exposed but undeveloped.