I learned a lot from this thread. I knew absolutely nothing and now I now more than that. Thanks
Ok ok! Here's what I've discovered!
The jacket was manufactured by Irvin Airchute. It is apparently quite clear from the collar shape and the smaller collar rings.
The photo of the label shows a '39' which dates the jacket to a 1939 production. The wires would have enabled the crew to use heated gloves and the intercom system in the plane. However, the umbilici (the cables that would plug the jacket into the airplane) have been cut off (normally done because they would get in the way when wearing after the operational usage).
I contacted Irvin Repairs and Sales and found that the serial number in the label will not lead to any history of the jacket, it really only shows the date and obviously authenticates the jacket.
I'm not going to get rid of it, instead I am going to get it repaired. I quite like it and enjoy day dreaming about what brave individuals would have worn it before me!
Regards,
Clint