a)
The speaker wouldn’t do what Ann Timson did.
b)
- a have-a-go-hero → someone who gets involved when a crime occurs and tries to stop the criminal(s)
- [if / when] push comes to shove → when faced with the reality rather than the story
- jumped on the bandwagon → did or supported what everyone else was doing because it's fashionable or might bring you personal gain
- I take my hat off to her → I respect her for what she did
- I'd probably leg it → it's likely that I'd run away
- I'd do my bit → I'd do what's expected of me