I took the key out of the ignition after driving for about 50 minutes and it felt a little odd. Got out the car, locked it with the fob then went to push the blade back in to the fob.
That was when I noticed the blade was bent at the base by about 45 degrees. With very little pressure, and I really do mean very little pressure, I wondered if it would bend back, but it immediately snapped at the base.
I have no idea how it bent in the first place as it was completely fine when it went in to the ignition. It certainly didn't get knocked during the journey so it's a total mystery. Unless it was the can of Irn Bru that I drank?