Thanks for your email response.
Yes it has just starting happening but so far it's just once the other day and I've not been in the car since.
Nothing has been changed on the car, I'm very happy with it and I don't intend to do any mods because I don't think it needs any.
It's just weird because the radio was on as I arrived outside my house and turned off the ignition, withdrew the key and was about to get out of the car and I instantly thought, that's funny, the radio is still on. After about 30 seconds, it was still on so I turned off the radio using the off/on button on the top left of the unit. The radio did go off but the display remained on so I got out of the car and double locked it and went indoors.
Maybe that behaviour is the default in the settings? I.e. Radio unit to remain on when the key is removed?
I've not used the car since but I'm hoping that this behaviour is normal and I would appreciate it if any other members with 'late' 2013 Fiesta Titanium or similar, would try this out in their cars and post back with what happens when, with the radio on, they turn the ignition off and remove the key.
My previous Fiesta was a Mk7 and I had that from new on a 60 plate right up until November 26th last year and I don't recall this issue happening with that car. With the radio on, I would just remove the key and the radio & display would immediately go off.