Bill Edgar's Wednesday trivia question

Question – Barcelona have enjoyed the longest current unbroken stretch of participation in European football, which stands at 50 campaigns (the first two of which were the elongated Fairs Cup tournaments of 1955-58 and 1958-60). Which club has the second longest current unbroken stretch?   

Come back tomorrow for the answer.

Yesterday we asked you: What do the following years have in common in relation to English clubs in European competition: 1968, 1970, 1971, 1981, 1984?

Answer: They are the five years in which English clubs won two of the main trophies (ie, excluding the Super Cup). 1968: Manchester United (European Cup) and Leeds United (Fairs Cup). 1970: Manchester City (Cup Winners’ Cup) and Arsenal (Fairs Cup). 1971: Chelsea (Cup Winners’ Cup) and Leeds United (Fairs Cup). 1981: Liverpool (European Cup) and Ipswich Town (Uefa Cup). 1984: Liverpool (European Cup) and Tottenham Hotspur (Uefa Cup).