From what I can make out the BBC has the sole choice of selecting "talent" for the Eurovision contest and unlike other countries there is no dry run on the airwaves to see how their choice may be received.
No surprise their offering bombed.

As some soul posted on the internet:
"The BBC chooses our entry and doesn't bother with a contest, or the live television voter-drawn trials. So every year, Britain sends some unprepared soul to perish on the world stage."