The thing that immediately strikes me as wrong is the backward lean which starts after the top line.. there is always a pronounced forward and upwards thrust on all the other samples,,except here..! And when you look close for a while,,,the handwriting can be seen to change halfway along the top line. One person started and another finished, thats what it looks like to me.. Curious indeed,,,with a Wearside voice that could not be identified.. What does it suggest,?? Don't look for my handwriting,, Look for this voice instead.... A trick is more likely,,he wanted them to focus on the voice............ Why Why Why..??
The clue is that the biggest manhunt in UK history failed to find the man with that very identifiable voice..