Not their first single but their first and biggest hit, Love Affair's 'Everlasting Love' is a great track to hear pretty much any time of the day. Their lead singer was Steve Ellis, who had a Motown twang to his voice, I remember hearing this regularly at the Hurst Road Boys Club in the early 70s.
The band had a couple of follow-up hits, including 'Rainbow Valley', which was released later in 1968, which to my mind is the only one the stood out from from the crowd.