Eurovision’s viewing figures have taken a shock blow since last year, it has been revealed, as a string of controversies surrounding this year’s song contest continues to spiral. Saturday night’s final, broadcast by the BBC, reeled in an average of 7.64million people and peaked at 8.46million, according to official figures from Digital i. While last year’s competition – hosted in the UK for the first time in 25 years – enjoyed a five-minute peak of 11million people tuning in, with an average viewing figure of 9.98million, the BBC said at the time. Swiss act Nemo ended up taking home the trophy…