Renowned trainer Dave Coldwell - who looks after Tony Bellew - gives us his view on Twitter.

Image source, David Haye

David Haye weighed in for this fight at 16st 3lb and 5oz - the heaviest he has ever been. 

Some have said that was done to be able to take more of a punch, others say it is just age.

"It’s helped around my joints," Haye, 35, told iFLTV, external. "I carry it well. I’m not bulked up in any way. I’m focused more on quality eating."

Mark de Mori came in over a stone heavier at 17st 5lbs and 8oz.

And - to a remix of McFadden & Whitehead, external's 'Ain't no stopping us now', David Haye emerges in a white gown with gold trim. Gold gloves, he claps them together and he's having a little sing song on the way to the ring.

There are confident nods, cheeky grins, the old trademarks. He stops at the ring steps to soak in his surroundings as the spotlights rain down. One fist to the heavens, the O2 responds with noise.

And over to our MC: "And Ladies and gentlemen, after three and a half years. Please welcome...THE HAYEMAKER... David Haayyyyeeeee."

And, slightly earlier than we anticipated, we seem to have ring walks.

Mark de Mori sports a black ensemble. A zip up with a hood has flashes of red on it. He looks serious to say the least as some heavy metal rings out around the O2. 

De Mori makes it to the ropes and has a confident stare at the masses. It's a gutsy stance, a few boos come his way. Hard to tell if this is all bluff? He must be rattling a little inside.

Image source, .

Given Mark de Mori is used to the warmer climates of Australia and Croatia perhaps it's unsurprising he quite candidly admits he does not like the weather Great Britain has served up this week.

"I don’t enjoy cold weather, I’ve been going from the gym to the hotel to the gym," said the 33-year-old. "I’m not here to enjoy London though so that’s what you’ve got to do.

"No one else is expecting much from me but I’m expecting much of myself. My history has always been when there's a big moment I’ve always responded really well."

Image source, BBC Sport

Australian Mark de Mori is ranked as the 10th best heavyweight in the world by the World Boxing Association (WBA). 

The 33-year-old has built an impressive record with 26 out of his 33 fights won by knockout, and he has only lost once. 

He now lives in Croatia with his wife Marijana, who holds a Croatian record in weightlifting. 

De Mori had a tough childhood after growing up partly deaf and suffering from chronic asthma but as you can see, he's a very strong lad, particularly for someone who follows the vegan lifestyle. 

If you are just joining us, we expect the ring walks at around 21:50 BST, so about 20 minutes until we see the fighters.

David Haye arrived in a leather jacket and white t-shirt looking pretty chilled it's fair to say. Mark de Mori strolled in wearing a black t-shirt and black jogging bottoms with a slightly more serious cut to his jib.

Hands are being wrapped, no turning back now.

Telegraph boxing writer Gareth Davies informs us the O2 Arena is full for the return of David Haye.

Darren Hall:@mrdavidhaye, external will win this inside 3 rounds. Needs more respect than he is given.

Chongzy88: #haye, external to win by Knockout in the 6th.

How will David Haye's career end? More glory, or with a humble beating? Tweet us on #bbcboxing, external.

Image source, Getty Images

How will David Haye's return to the ring end? 

A stunning title victory in the coming years? Or a harsh slap in the face to overshadow his former glories?

Tweet us on#bbcboxing, external.

Those of you who have seen footage of Mark de Mori in action will have noticed it all looks pretty low key and has the picture quality of a 1980s camcorder.

The big Australian packs a whack but tonight is a very different level. That is, of course, if David Haye can summon even a small portion of what we once knew.

Image source, David Haye

Yes, let's get it out of the way, today is #HayeDay. 

My oh my, how did David Haye's publicity team think that one up?

Hardly the most inventive marketing cry but hey, many would argue it got the job done. 

The likes of England rugby stars James Haskell and Danny Cipriani have used the hashtag to talk the fight up. After this fight we return to normality so tomorrow is #Sunday.

Good evening folks as we welcome David Haye back from the boxing wilderness.

He once unified the cruiserweight division. He once held a world heavyweight title. He gave us a Wladimir Klitschko showdown...

Image source, Getty Images

Now, after cancelling a contest with Tyson Fury due to injury in 2013, Haye returns to the ring.

Why? Money? He says this is about "legacy". He has some way to climb to reach former heights. Tonight is rung one on the ladder.

But boxing returns are not always the comic-book glory stories weaved by Sugar Ray Robinson and George Foreman. Sometimes they hurt. Sometimes they blur former glories.

Image source, Getty Images

"People have got behind me. They remember the good old days and want some more of them."

David Haye.

Image source, Getty Images