BIB 1 - Abba's first ever TOTP appearance was introduced by Noel Edmonds on 11 April 1974 (the week after they won Eurovision).
BIB 2 - Abba's second 'Waterloo' performance was introduced by Jimmy Savile on 2 May 1974 (the same week it reached No. 1); it was featured on TOTP2 last year:
The 'SOS' clip from October 1975 is erased from history although I did see it at the time (from memory the girls were dressed in the same clothes they had on in the TOTP studio for 'Fernando' in April 1976).
When the 'So Long' clip from 5 December 1974 surfaced on YouTube last year it was the first time I had seen it since its original broadcast which I also clearly remember (a discussion started on page 107 of the TOTP 1977 thread about this on 07-06-12):
Am I alone in thinking that the Eurovision winner for Abba in 1974, Waterloo is actually one of their worst records, admittedly out of a fantastic bunch? The British jury clearly held my opinion back then because amazing as it seems the UK did not give the winning Abba song a single point so I have heard! How very bizarre in the context of the history of what followed. The hiatus between them winning, their subsequent under performing singles and then smashing into the big time again 2 years later is rather curious, and inexplicable to me. I've heard it said that the 1985 hit I Know Him So Well could easily have been an Abba hit, likely their 10th No1 if they had recorded it, instead of Paige & Dickson for Chess the musical. You can easily see why! Elaine and Barbara almost did the Abba girls moves and looks on TOTP at the time if I recall, and of course it was written by the Abba guys anyway. Wish Abba had done it and topped the charts themselves for that month in February 1985.