It was showbiz and most definitely not Crawley Town at home in League One.

Birmingham City dimmed the lights just before kick-off and had a DJ perform rap music in the darkness while a few stray players wandered around.

No Tom Brady, maybe, but St Andrew’s — a place where they wondered a few years ago if there really was going to be a future — sparkled to the light of smartphone torches and echoed to the most cacophonous noise.

There was some decent football to back those bold claims up. An opening goal from the gods inside 43 seconds and performances from Tomoki Iwata, Keshi Anderson and Ethan Laird to push Newcastle hard. But it was not as emphatic as we had anticipated. Birmingham’s £15m striker Jay Stansfield, the jewel in their crown, did not deliver a shot in anger.

Newcastle know a bit about newly acquired wealth, too. It was their depth in reserve which took them into the FA Cup fifth round, to go with that Carabao Cup final.

Newcastle booked their place in the FA Cup fifth round with a thrilling 3-2 win over Birmingham

Birmingham gave the match a showbiz build-up and stunned Newcastle in the first minute

Ethan Laird shocked the Magpies as he gave Birmingham the lead inside 40 seconds

There was a significant performance, and two goals, from Joe Willock in his difficult, injury-stained, stop-start season which had started with his expressing ambitions to play for England. There was a claim on more starts from the Danish Under-21 international Will Osula, who really seized the night.

These impacts were by no means instantaneous. Birmingham’s plan was to go like hell at a Premier League side featuring nine changes from the Carabao Cup win over Arsenal in midweek, and for a time it worked.

A mist cloaked this place when the lights went back up, you could see the steam of the players’ breath and Newcastle were stunned by what they first encountered.

Not just an opening goal shipped in just 43 seconds amid some calamitous defending — Keshi Anderson granted the freedom of Birmingham to head Kieran Dowell’s corner back in for Ethan Laird, who was left at liberty to crack a volley which Callum Wilson sliced past Nick Pope — but attacking momentum which they struggled to cope with.

Scott Wright’s advance beyond Dan Burn, a loanee here 12 years ago, caught the eye. Wright desperately clung on to the Scot’s shirt as he span around him and took a yellow card. There was Anderson’s physicality down the left, nimble and physical, and, naturally enough, the quicksilver £1million Japanese Tomoki Iwata, a gem here all season.

It was a measure of Howe’s squad depth that Newcastle not only clung on, but turned that setback into a lead. He had issued one of those warnings for his starters that this was a rare chance. Howe has not seemed ready to trust Osula, the £10m summer back-up signing from Sheffield United, and has indicated the player isn’t happy about that. Osula won’t die wondering about his third start of the season.

Birmingham seemed to fancy their chances against him when Cochrane upended him in the early minutes but 21-year-old drove against them with energy. His unpredictability is not always a good thing. You wouldn’t bet the house on him. But he was the least unhindered by the sound and fury all around. He was the one who squared for Willock to equalise after a driving run through Birmingham’s midfield by Callum Wilson, also seizing a rare chance here.

The equaliser was shrouded in chaos, with keeper Bailey Peacock- Farrell adjudged to have been behind his line when he blocked Willock’s shot. A very close call, with no goal-line technology to rule on it. Osula had strayed towards the path of the shot and almost conspired to block it.

Newcastle got on level terms as Joe Willock’s strike was deemed to have crossed the line

Callum Wilson beat the goalkeeper to a high ball, expertly navigating it in with his right boot

Tomoki Iwata provided a moment of brilliance to equalise from distance after 40 minutes

Willock applied another finish in the 82nd minute to secure victory for Newcastle 

He was also involved five minutes later when Wilson beat the goalkeeper to a high ball, expertly navigating it in with his right boot.

Newcastle seemed to be wresting back control when Iwata provided a moment of brilliance to equalise, latching on to a ball headed out of defence by Matt Targett to beat Nick Pope from 30 yards.

Better finishing from the home side would have put Newcastle on the back foot, because they certainly had other chances here. Stansfield sent a chance wide from six yards, a chance provided by Iwata. A big moment. Wright was also unmarked at close range when he missed.

Birmingham were under severe pressure before Newcastle found a third. Lewis Miley drove into box but shot straight at the keeper. And then the winner — Tino Livramento sent Sean Longstaff on the overlap and defender Ben Davies failed to prevent him sliding a shot ball for Willock, whose finish was sharp.

There could have been a Newcastle fourth goal after that. Substitute Jacob Murphy raced through on Peacock-Farrell after Cochrane missed a long diagonal and it took the retreating Davies to head off the line after the forward beat the goalkeeper.

Newcastle’s fans were quick to crow. ‘Premier League, you’re having a laugh,’ they sang as their team closed out the game. But ambition, wealth and imagination permeate this place. Birmingham will tell you they’ve barely started.