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