Abba, pictured at the time of their landmark 1974 Eurovision win

The song, which is out on 17 May, coincides with this year's Eurovision, taking place in Istanbul on Saturday.

Abba's Gold album is also enjoying a chart resurgence inside the top 20, and has spent 486 weeks on the hit parade.

Singer Agnetha Faltskog's solo comeback single, If I Thought I Could Ever Change Your Mind, reached number 11.

Tribute bands

Faltskog - Abba's blonde vocalist - also released an album of sixties pop covers, which debuted at 12.

The 30th anniversary of the group's memorable Eurovision win in Brighton will see a series of events to mark the occasion taking place in Bristol.

A host of Abba tribute bands will play at venues across the city, while the theme of the weekend is distinctly seventies.

Lena Philipsson is this year's Swedish hopeful

The original line-up - Agnetha Faltskog, Anni-Frid Lyngstad, Bjorn Ulvaeus and Benny Andersson - have failed to publicly reunite since their split in 1982.

But the group briefly got back together last year to sing for a friend at her private birthday party.

Swedish hopeful

This year's Eurovision Song Contest will be quite different from the 1974 event which saw Abba's Waterloo win.

A total of 17 countries took part, while this year's event has attracted 36 participants.

The event has grown so much that for the first time a semi-final will be held on Wednesday night to determine the 24 countries who will sing in the grand final on 15 May.