In 1975, Knight linked up with former drummer Alan Whitehead to form 'Vintage Marmalade' with Sandy Newman (vocals, guitar, keyboards) and Charlie Smith (guitar). They were reunited with their old manager, Peter Walsh, to play all the hits on stage and had a full date sheet.  Later in 1975, after Ford and the remaining members called it quits, Knight and Whitehead took over the name Marmalade with the new line-up, fronted by Newman. They signed a deal with Tony Macaulay's Target Records and in 1976, had what turned out to be their final Top 10 hit with the ominously entitled, Macaulay penned song, "Falling Apart at The Seams". The song also reached the easy listening charts in the U.S. and made the Top 50 of the Billboard Hot 100, becoming the group's last charting single on the U.S charts. Subsequent singles failed to chart. One of these was "Talking In Your Sleep", produced by Roger Greenaway and released in January 1978, six months ahead of the Crystal Gayle version of the same song, which became well known worldwide.  Sandy Newman (ex-The Chris McClure Section, 1968-1970) has continued to front Marmalade since 1975, releasing a further eleven singles in the UK (excluding re-releases), seven of which were via Target Records, none of which have charted in the UK or US, and today they continue to tour the nostalgia circuit performing the band's full hit repertoire.  Charlie Smith departed in 1977 to join Nicholson in Blue, and Garth Watt-Roy came in briefly for Marmalade's Only Light On My Horizon Now album, before leaving for the Q-Tips in 1978. He was replaced by guitarist Ian Withington, who appeared alongside Knight, Newman and new drummer Stu Williamson for the next album Doing It All For You (1979).  Alan Whitehead left the band in 1978 to manage other pop groups and singers, which he has continued to do. He also appeared in the 2010 TV series Take Me Out and ran a lap dancing club.

Answer this question "What happened in the year 1978" by extracting the answer from the text above.
Alan Whitehead left the band in 1978 to manage other pop groups and singers, which he has continued to do.