By Nicola Methven A man who gave Abba “nul points” at the 1974 Eurovision Song Contest said he stands by his decision despite their rise to superstardom. Basil Herwald was one of 10 UK jurors who each had a point to award to their favourite performance – and not one gave it to the Swedish song Waterloo. His recollection is in next week’s BBC show When Abba Came To Britain, which tells the story of the band’s love for the UK after their Eurovision victory. Asked what he thought of them when they performed in Brighton, Basil says: “Not a lot. People say to me, ‘Surely you were blown away by them…