I've been doing some brief research around multiple number ones being in the chart at the same time, and the most I have found is for the w/e 9th Jan 2010 with 22 number ones in the listing simultaneously:

 

Number 1 - "Bad Romance" by Lady Gaga reached number one on 19/12/09

Number 2 - "The Climb" by Joe McElderry reached number one on 02/01/10

Number 3 - "Meet Me Halfway" by Black Eyed Peas reached number one on 21/11/09

Number 11 - "Fight For This Love" by Cheryl Cole reached number one on 31/10/09

Number 12 - "Bad Boys" by Alexandra Burke featuring Flo-Rida reached number one on 24/10/09

Number 14 - "I Gotta Feeling" by Black Eyed Peas reached number one on 08/08/09

Number 15 - "Everybody In Love" by JLS reached number one on 14/11/09

Number 30 - "Sex On Fire" by Kings Of Leon reached number one on 20/09/08

Number 32 - "Poker Face" by Lady Gaga reached number one on 28/03/09

Number 33 - "Sexy Chick" by David Guetta featuring Akon reached number one on 29/08/09

Number 34 - "Beat Again by JLS reached number one on 25/07/09

Number 35 - "BBC Children In Need Medley" by Peter Kay's Animated All Stars reached number one on 05/12/09

Number 38 - "Break Your Heart" by Taio Cruz reached number one on 26/09/09

Number 40 - "Killing In The Name" by Rage Against The Machine reached number one on 26/12/09

Number 43 - "Oopsy Daisy" by Chipmunk reached number one on 17/10/09

Number 45 - "Boom Boom Pow" by Black Eyed Peas reached number one on 23/05/09

Number 50 - "Boys And Girls" by Pixie Lott reached number one on 19/09/09

Number 51 - "You Are Not Alone" by X-Factor Finalists reached number one on 28/11/09

Number 52 - "Bonkers" by Dizzee Rascal featuring Armand van Helden reached number one on 30/05/09

Number 54 - "Just Dance" by Lady Gaga featuring Colby O'Donis reached number one on 17/01/09

Number 63 - "Number 1" by Tinchy Stryder featuring N-Dubz reached number one on 02/05/09

Number 67 - "Telephone" by Lady Gaga featuring Beyonce reached number one on 27/03/10

 

With only "Telephone" being a future number one, the total of 20 past number ones I believe is

also a record.

 

I haven't got sufficient data to hand at present to show the chart with the most future

number ones on, can anyone help?

It's amazing to see so many big hits in a chart at the same time! :o

 

I guess the past few years would rank quite high in things like this, because we get a lot of 1-weekers, but a lot of them also spend FOREVER in the chart. Apparently before you'd get lots of new entries each pushing songs down, but now you get like 2 new entries every week, so songs can stay around for ages.

 

I would imagine the chart with the most future #1s in would've been back in the time where nearly every song used to climb up the chart to its peak. In the past few years, I doubt there'd be a chart containing any more than 2 or 3 future #1s.