OK, what do we think to this?
Joe had a deathbed confession from Nic. We don't know what she said but Joe was shocked to his core.
13th March - Joe makes a shocking admission.
14th March - Alistair's world falls apart.
That suggests to me that either Shula or Alistair ran Matt over and Nic saw it but didn't tell the police.
Thoughts? I can't now remember what Alistair was doing that night. Shula should have been in the thick of things at the ball, unexplained absence for a few minutes very conspicuous, but this is Ambridge and nothing can be ruled out.