Manchester United in the European Club Champions Cup.
The UEFA European football championship was inaugurated in 1955 in Paris, at the suggestion of the French sports journalist and editor of L'Équipe Gabriel Hanot as a continental competition for winners of the European national football leagues, as the European Champion Clubs' Cup, abbreviated to European Cup. http://www.myfootballfacts.com/EuropeanCompetition.html
The oldest football competition still running to this date is the English FA Cup which was first played in 1872.
the first team to play in a European competition that was british was Hibernian
when were subs first used in English football
In the Europen cup countries play not clubs so Liverpool could not play.
The UEFA European Football Championship was first held in 1960.
Launched in 1888 by the The Football Association as the Football League, the competition gave way in 1992 to the Premier League, whose official name is the Barclays Premier League since 2004.
1957 - Manchester United Football Club is an English football club, one of the most popular football clubs in the world, based at Old Trafford in Greater Manchester. The club was a founding member of the Premier League in 1992, and has played in the top division of English football since 1938, with the exception of the 1974-75 season. Average attendances at the club have been higher than any other team in English football for all but six seasons since 1964-65.In 1968, they became the first English club to win the European Cup, beating Benfica 4-1. They won a second European Cup as part of a Treble in 1999, before winning their third in 2008.In the 1956-57 season, they became the first English team to compete in the European Cup, at the behest of the FA, who had denied Chelsea the same opportunity the previous season, and reached the semi-final, only to be knocked out by Real Madrid.
Manchester United! 1968 UEFA CUP! No its was Spurs cup winners cup Man U were the 1st English team to win the European Cup Celtic were the first british team to win the European up 1967