For anyone wondering what songs
just missed out on the accolade of becoming a #1 and a contender for this competition, because they peaked at #2 in the UK, here is a list taken from
https://www.officialcharts.com/chart...-chart__24082/
Adele - Chasing Pavements
Appleton - Fantasy
Arctic Monkeys - Brianstorm
Ashanti - Only U
Avril Lavigne - Girlfriend
Benny Benassi - Satisfaction
Beyonce - Baby Boy
Black Eyed Peas - Shut Up
Bodyrox - Yeah Yeah (feat Luciana)
Booty Luv - Boogie 2nite
Britney - I'm Not A Girl... / Me Against the Music / Piece of Me
Cascada - Everytime We Touch
Charlotte Church - Crazy Chick
Cheeky Girls - Cheeky Song (Touch My Bum)
Christina Aguilera - Ain't No Other Man
Christina Milian - Dip It Low
Coldplay - In My Place / Speed of Sound
Corinne Bailey Rae - Put Your Records On
Daniel Powter - Bad Day
Dannii Minogue - I Begin to Wonder
The Darkness - I Believe in a Thing Called Love
Destiny's Child - Bootylicious / Lose My Breath
Dido - White Flag
Electric Six - Danger High Voltage
Fergie - Big Girls Don't Cry
Girls Aloud - No Good Advice / Jump / The Show
Gorillaz - Feel Good Inc.
Gwen Stefani - Sweet Escape
iiO - Rapture
Jamelia - Thank you
Jay-Z - Empire State of Mind
JoJo - Leave (Get Out)
Justin Timberlake - Like I Love You / Cry Me a River / Rock Your Body
Kanye West - Gold Digger
Kate Nash - Foundations
Kelis - Milkshake / Trick Me
Kevin Lyttle - Turn Me On
The Killers - When You Were Young
Kylie - Love at First Sight / I Believe in You
La Roux - In for the Kill
Madonna - American Life / Hollywood
Mariah Carey - We Belong Together
Mark Ronson - Stop Me / Valerie
Michael Jackson - You Rock My World
Mis-Teeq - Scandalous
Mutya Buena - Real Girl
No Doubt - Hey Baby
Oasis - Stop Crying Your Heart Out
Puretone - Addicted to Bass
Pussycat Dolls - Beep
P!nk - Get the Party Started
Rachel Stevens - Sweet Dreams My LA Ex / Some Girls 
Red Hot Chili Peppers - By the Way
Rihanna - Pon de Replay / S.O.S. (Rescue Me) / Unfaithful / Russian Roulette / Rude Boy
Shakira - Wherever, Whenever
Sophie Ellis-Bextor - Take Me Home / Murder on the Dancefloor
Soulja Boy - Crank Dat
Supermen Lovers - Starlight
T.I. & Rihanna - Live Your Life
Ultrabeat - Pretty Green Eyes
Wheatus - Teenage Dirtbag
There're a host of other good ones but I couldn't see them doing well in this competition. Particularly gutted by the loss of both Rachel Stevens singles and Booty Luv, here.