So I watched the video that Terry smith put up on making a knife from an old putty knife. You can find the video here
For a bit of fun I decided to give it a go.
Blade length: approx. 110mm (4.3")
Blade width: approx. 25mm (0.98")
Blade thickness: approx. 1.6mm (0.06")
Overall length: approx. 210mm (8.26")
I'm yet to really test it out, hope to do that in the next few days...
Thanks for looking!