Mel Giedroyc presented the programme, kicking off with last year's winner of the Eurovision Song Contest, Måns Zelmerlöw, before introducing the six songs that had made it through one of the biggest song searches the BBC has ever held to find its Eurovision entry.
Although there was an expert panel including Eurovision veterans Carrie Grant (UK 1983) and Katrina (winner for the UK in 1997) in Eurovision: You Decide the United Kingdom public made their choice with 100% televoting, and it was the duo Joe and Jake with the song You're Not Alone that received the most votes.
Immediately after their winning performance, Joe and Jake were quickly taken off to a press conference. The pair hadn't even had time to take calls or texts from their families, so could only imagine their reaction.
Describing the atmosphere tonight in the O2 Forum they said "it was amazing, there was so much energy, that it lifted our performance, the crowd made us want to try even harder."
As to winning the contest, "it means the world to us, we are very proud indeed, we couldn't be happier."
The paid had been praised by the judges for their chemistry on stage - "that comes down to being good friends".
Attention will turn to the all important staging of their song in Stockholm, "we want it to be a big performance, so we will see if we can pull a few tricks out our sleeves."
"We owe it to the public to try and win that trophy. It is an absolute privilege to represent the United Kingdom. Tonight has gone well and we now need to look forward."
These were the six participating songs in order of appearance (writers between brackets):
Although the UK public decided the outcome, there was an expert panel on hand to make their assessment on the six finalists. They were:
There was a special tribute to the late Sir Terry Wogan, who provided the BBC commentary on radio and television between 1971 and 2008, and was co-presenter on the 1998 Eurovision Song Contest when the event was last staged in the United Kingdom in Birmingham.
Joe and Jake will represent the United Kingdom in the Grand Final of the Eurovision Song Contest on the 14th of May in Stockholm.
What do you think of the United Kingdom entry for 2016? Tell us below.