The Greatest British Songs of All Time?

Currently on Radio X they're asking their listeners to pick their top 5 greatest British songs of all time.
Simply put what would be your top five choices?

Top 5 is hard! Its even harder picking songs that I think are the best written but not personally in my fave top 5 (if that makes sense). Here goes - these are songs that I think are incredible pieces of music writing and producing:

Procul Harem - Whiter Shade of Pale
Queen - Bohemian Rhapsody (not even in my top 5 queen songs personally)
Bowie - Life on Mars (never realised how good this was until all the air time recently)
The Moody Blues - Nights in White Satin
The Rolling Stones - Sympathy for the Devil

Picking a best british band / singer of all time is bad enough let alone best songs

Interesting. Do I base my list on what's steeped in British Culture and represents it? Or just pick based on taste alone. I'd plump for and not in any particular order:

The Beatles - Let It Be
The Kinks - You Really Got Me
Kate Bush - Running Up That Hill
Queen - Bohemian Rhapsody
Joy Division - Love Will Tear Us Apart

Motorhead - Ace of Spades
Vera Lynn - We'll Meet Again
Bud Flanagan(?) - Theme from Dad's Army
Black Lace - Agadoo
Serial Dave - Mix tape featuring the sounds of Beiber, Kanye, Taylor Swift etc being murdered.