ABBA arrived by taxi (Agnetha and Frida sitting together and Benny and Björn sitting opposite them) fairly early into the red carpet arrivals.  They started off talking to the press together (ie. all four of them) but their PR split them into two couples (Björn & Frida and Benny & Agnetha) shortly afterwards to speed things up.  So there were some interviews with all four of them initially. 

It was noted that Björn, so heavily involved in the pre-show promotion, took a back seat and let Agnetha and Frida do a lot more of the talking.

At one point, they broke free from the red carpet to stand for photos in front of the crowds of fans. Benny even signed something for a fan in the crowd.

Celebs appearing (in no particular order):

• Swedish: Lasse Hallström and actress-wife Lena Olin, Görel Hanser, The Evas (Eva Dahlgren and Efva Attling), Mark Levengood (TV personality who interviewed Frida in 1996 for Mitt i livet), Carola Häggkvist (1991 Swedish Eurovision winner), Peter and Nanne Grönvall (Benny's son and daughter-in-law from Swedish group One More Time), Helen Sjöholm, Lars Rudolfsson, Tomas and Marie Ledin, Thomas Johannson, Bea Åkerlund, Anders Hanser, King Carl XVI Gustaf and Queen Silvia of Sweden (attending as friends, not in an official royal capacity), Tommy Körberg (with wife Kristi), Zara Larsson (singer), Linda and Christian Ulvaeus, Anders Eljas, Ingmarie Halling and Wenche Myhre.
  
  Others (mostly British): ABBA Voyage Band, Blossoms (indie pop band), Alistair Campbell (British political advisor), Jarvis Cocker (singer with Pulp), Judy Craymer (creator of Mamma Mia! ), Dan Daniell (Swiss personality and friend of Frida), Grace Dent (food critic), Sophie Ellis-Bextor (singer), Rupert Everett (actor), Rupert Graves (actor), Paul Greengrass (film director) Natalie Imbruglia (singer), Myleene Klaas (singer/broadcaster), Penny Lancaster (wife of Rod Stewart), Phyllida Lloyd (director of Mamma Mia! The Movie ), Matt Lucas (comedian), Victoria Hesketh (Little Boots) (musician intended to be part of the Voyage band but had recently had a baby), Steph McGovern (TV presenter), Clodagh McKenna (TV chef from This Morning ), Kylie Minogue (singer), Kate Moss (model), Steve Norman (Spandau Ballet), Erin O'Connor (model), Elaine Paige, Andrew Pierce (journalist), Sir Tim Rice (lyricist), Sharleen Spiteri (from pop group Texas) with her daughter, James Righton and Keira Knightly (musician and actress respectively) and the ABBA body doubles with choreographer Wayne McGregor (Back row L-R: Léø Elso (Benny), Isabel Le Cras (Agnetha), Heather Birley (Frida), male*, Liv Austen (Agnetha).  Middle: male*.  Front row: Wayne McGregor (choreographer) and Sonya Cullingford (Frida).
  *William Collins/James Pattison (Björn) and Benny (Max Hessman (Benny) - I don't know which is which and it looks like one male is missing from the photo. Identities assumed from internet/Twitter photos but may not be 100% correct. Please do let me know if I have names mixed up re: body doubles.
  
  At the end of the show, all four ABBA members appeared on stage to take applause.
   

Broadcasts and footage:

1. ABBA's Journey to the Arena
   Footage published by ABBA Voyage shows Benny hailing a London black taxi cab, holding the door open for Frida, Agnetha and Björn before getting in himself and then them all getting out at the ABBA Arena.  A great idea to show ABBA showing up in a taxi cab rather than big, posh cars.  They left from The Stratford Hotel, International Way, E20 1FD, 8 minutes car drive from the ABBA Arena.
   Set to The Visitors.
    
2. Private footage
   Short private footage from someone who was there outside ABBA's hotel shows Benny hailing the cab and ABBA getting in.
    
3. The Sun Showbiz - Celebrities arrive for the premiere of ABBA's new stage show
   A live-stream of the VIP arrivals on the red carpet.  Interviews with Svana Gisla (Producer), Bailie Walsh (Director), Wayne McGregor (choreographer).  First appearance of ABBA is about 54 minutes in.  They are then interviewed by the BBC Entertainment Correspondent Colin Patterson and then someone else.  They were asked how they got involved with ABBA again, what their families think of the show (they hadn't seen it yet at that point) and memories of their last concert in Japan.  Agnetha said she was very emotional.  They were asked whether they'd be anything else from ABBA. Frida said you never know if they carried on living!   Benny reckoned they'd done enough.
    
4. NME (New Musical Express)
   Interview firstly with Björn and Frida and then Agnetha and Benny. Benny makes the point that the NME used to hate ABBA!   Frida said she felt fantastic and said she'd already seen the show, the previous Monday but that she wanted to see the audience reaction again.  Agnetha said she felt a bit tense but excited.  Benny said that the five weeks they spent together recording the show was really nice - they spent all day together and had lunch together every day etc.  When asked if there'll be anything more from ABBA, Benny said that after this, they'll go home and sleep!
    
5. ABBA Voyage TikTok
   A montage of footage of ABBA's red carpet arrival. Zara Larsson steals a kiss and a hug from Agnetha.
   Set to Summer Night City
    
6. ZIB 2 - ORF (Austria)
   Very brief interviews with Frida and then Benny.  Queen Silvia also says a few words.  Broadcast 27 May 2022.
    
7. AP Archive
   Interview with Björn and Frida and footage of ABBA.
    
8. The Project (Australia)
   Brief report from a London correspondent, Lucy McDonald, who referred to “fat Benny from ABBA”.  Rude.
    
9. ORF News - Aktuell nach Eins (Austria)
   Uses footage from 1. above and 6. above.
    
10. Nyhetsmorgon (Sweden)
    TV4, Sweden - broadcast Sunday 29 May 2022
    Anders Philbad presented his report from the ABBA Voyage première including interviews with Agnetha and Benny and King Carl Gustaf, Carola Häggkvist, Eva Dahlgren and Efva Attling, Elaine Paige, Jacob Wallenberg (Swedish banker), Jonas Gardell and Mark Levengood, Lasse Hallström and Lena Olin, Ludvig Andersson, Tomas Ledin, Peter and Nanne Grönvall, Marie Ledin, Queen Silvia, Tommy Körberg, Wayne McGregor and Zara Larsson. 
     
11. Style Record Group. com
     Uses footage from 1. above in a better, edited, format.
     
12. Tik-Tok live stream
    Hosted by Josh Smith with intermittent footage of the making of ABBA Voyage.  He starts off talking to fans.  But there is a brief interview with ABBA and he also talks to the ABBA Voyage band, Bailie Walsh, Svana Gisla and Ludvig Andersson, Wayne McGregor, Elaine Paige, Ben Miller (Industrial Light & Magic), Penny Lancaster, Steph McGovern, Zara Larsson, Kitty Scott-Claus and Ella Vaday, Mylene Klaas, Stacey Haynes, Grace Dent, Kylie Minogue and Rupert Everett.
     
13. ABBA Voyage - Can we relive this night?
    Footage already used but with extra celebrity interviews
     
14. Jamie Lowe
    Social media broadcaster starts off talking to fans and there's a brief interview with Elaine Paige and Sharleen Spiteri.  Plus Björn chats to him.
     
15. Sveriges Radio (Sweden)
    Benny and Agnetha chat to Carolina Norén. Benny talks about the show that they have been working on for over five years. Agnetha will see it for the first time. She also comments on the fact that the four of them are there together ”it is quite emotional”. When asked if we can expect more ABBA-news. Benny replies, ”No, this is it”. Agnetha says ”we are not in our thirties anymore”.
     
16. @howelldavies
    This is the brief snippet of Agnetha being asked if there will be any more - and Benny jumps in and says, "Why is everyone asking that if tit'll be more?   We're doing something after 40 years, we make an album, we make this, we built an arena and we work five and half years to achieve something and you are asking will there be more?!   Noooooo!!!"  Agnetha touches his arm and says, “They want more!”.
    
     

Agnetha's coat was by Fendi.
Frida's jacket was also Fendi, as were her trousers.
Benny's long, brightly-coloured coat was by Yohji Yamamoto.

Thanks to Jan Bach, Kevin Munns, Jason Swan, Jonathan Bollen and Hjördis Bye, Gordon Holm and Ray Morrison c/o ABBAtalk.
Extra thanks to Monique Hoevens. Yoland Zorio.
YouTube videos c/o The Sun Showbiz, NME, André Selbach, AP Archive, The Project, Style Record Group. com, ABBA XXI, Jamie Lowe and Abba Moments