Charlie Austin is booked for kicking the ball away.

David Davis brings down Charlie Austin with 45 seconds to go. Free-kick and that'll be that.

Half chance for Blues.

Jefferson Montero crosses, it's behind Alvaro Giminez and he can't connect with the scissor kick properly.

Sam Johnstone gathers easily. 120 seconds to go.

Matheus Pereira curls one over from the edge of the box and into the Baggies fans.

They aren't going to return the ball quickly.

Paul Devlin
Former Birmingham City midfielder on BBC WM 95.6

Albion haven't played that well today but they've possibly ground the result out.

Seeing the game out now will be the test for them.

There will be four minutes of added time.

Blues are piling forward now.

Kristian Pedersen can't get a header from a corner on target.

How many minutes of stoppage time will they get?

Ged Scott
BBC Sport at St Andrew's

With a vintage name like Austin, you’d have thought coming to the Midlands at this stage of his career would have been an ideal stage for the 30-year-old to flourish.

Instead, Charlie Austin made rather a comparatively slow start to his Albion career, struggling to get out of third gear at times. And he’s even been garaged.

But that is now six goals in five games.

His equaliser was a real fan-belter. With a first touch like that and a shot to match, you just don’t stop those. And now a superb far post header to follow.

It’s 'boing boing Baggie Baggie' time now. And a loud rendition of The Lord Is My Shepherd at St Andrew’s!

And that missed header is Jeremie Bela's last contribution.

He comes off with Ivan Sunjic, and on come Josh McEachran and Jefferson Montero.

Crikey, Birmingham really should be level.

Jeremie Bela, goal gaping, heads over from a few yards.

Tony Brown
Former West Brom striker on BBC WM 95.6

The ball in from Darnell Furlong makes that goal, Austin has come on, he's fresh and he's rewarded the manager who you've got to praise, the two subs combine for the goal.

Good save!

David Davis has a go from 20 yards and Sam Johnstone tips it away.

I'm not sure the scoring is done here you know.

Alvaro Giminez sends in a low cross but it's just behind Birmingham midfielder Ivan Sunjic.

It was 3-2 the last time these teams met in March. Same again?

Lukas Jutkiewicz would have expected to do better with his head.

The ball is crossed into him, but he nods way over from distance.

Gary Gardner is straight into the thick of things.

Kyle Bartley barges into the Blues midfielder, and suddenly it's all kicking off again.

Referee Rob England calms things down quickly though. He's been excellent, in what has been a feisty derby at times.

Tony Brown
Former West Brom striker on BBC WM 95.6

That is a terrific goal from Charlie Austin, a proper striker's goal, on the turn and he's hit it into the corner - a great substitution from Slaven Bilic.

In the aftermath of the Baggies equaliser, Birmingham make a change.

Teenager Jude Bellingham makes way for Gary Gardner.

For a side who love scoring goals - 43 this season - West Brom have been way off the mark today.

They've had just the one shot on target, Grady Diangana's goal.

What have they got left in the final 20 minutes at St Andrew's? At the moment, Leeds are staying top.