Disappointed - I thought/read there was a “verbal agreement” in place to return. Did he really think he’d be left without a team spot elsewhere (that would NEVER have happened) if Birmingham decided not to continue?

After the Speedway Stars revelation that Mulford was back at Redcar I've heard he's going to Glasgow.

I don't think it can be, even owning a riders contact couldn't be enforced if it went to a court hearing etc. but have previously heard clubs getting warnings for "tapping up" riders, so assume there's some "rule" in place?

No.  How can that be forced with 1 year contracts.   

As this topic has been done to death over the last 18 months.

Unsure but I’ve got ace down at 2.93