Jonathan Kodjia bursts through for Villa - can he make it five?

No, the ball gets away from him and it's cleared.

In the aftermath of that Alan Hutton goal, Villa and Blues both made substitutions.

Ahmed Elmohamady replaces Henri Lansbury for the hosts and Charlie Lakin comes on for Craig Gardner for Birmingham.

Ash: Went mad in Heathrow T5 when Tammy scored that penalty. Flight is boarding in 5 mins but they’ll have to pry this game from my cold dead hands. UP THE VILLA

The one time you want a travel delay...

There's a real air of tension around Villa Park. Understandably so with one goal in it. What do the hosts do now? Hold on to what they've got or go for a fourth goal?

Meanwhile Conor Hourihane bends in a free-kick from the right but it's straight into the arms of Lee Camp.

Tammy Abraham is back on for Aston Villa after a bit of treatment.

And now Tammy Abraham is down for Aston Villa.

It comes after a mass scramble in the box with Birmingham trying to clear their lines.

He looks like he's holding his lower back.

Villa make their second change - Glenn Whelan is replaced by former Arsenal man Henri Lansbury.

A big 20 or so minutes remain.

Ged Scott
BBC Sport at Villa Park

Image source, Rex Features

This really isn’t like too many derby games I’ve ever been to.

Whatever happened to all the tense, negative defence-minded tactics associated with such occasions?

Error after error, terrible marking, yes.

But five goals, and, with defending like this, the prospect of surely more to come.

The place is bouncing now.

And you wouldn’t want to call what happens next!

Tammy Abraham has to do better there.

Lee Camp palms a corner towards the Villa striker, but he heads over at the far post.

Meanwhile, Jacques Maghoma replaces Connor Mahoney for the visitors.

Image source, Getty Images

Albert Adomah has to be helped from the field. His replacement Yannick Bolasie is taking his time, so Villa's Conor Hourihane fires in a free-kick first and Lee Camp tips it wide.

Bolasie is now on.

Albert Adomah is really struggling here...

Wes Harding slams into Albert Adomah and out comes the yellow card.

The Blues man won the ball, but got a fair chunk of the Villa winger too.

Birmingham are inches away from making it 3-3!!

Connor Mahoney uses all his trickery to work an angle in the box but smashes the ball just wide.

Surely there are more goals in this?

This is better than a niggly, goalless draw isn't it?!

Challenges continue to fly in as Maxime Colin barges over James Chester before Jack Grealish goes in hard on Colin and comes out with the ball.

Villa look hungry for more goals.

Jonathan Kodjia fires an effort just over from 30 yards. What have Blues got left in the tank?

Tammy Abraham is hauled down in the box by Michael Morrison. Penalty!

The Villa striker controls the ball wonderfully and is about to fire his shot away when Morrison takes him down.