Undercover
Never let her slip away
There have been multiple groups that have used this name.

1) Undercover was a Hard Rock/AOR group by a ex-Vandenberg singer Bert Heerink from Netherlands who make 2 albums in the 90s. One was Undercover (1990), a cover album, and second record was All Line Up (1994).

Personnel:
Bert Heerink Vocals
Dick Kemper Bass, Vocals
Ronald Bekking Guitars, Vocals
Ivo Elfers Drums
Cyril Whistler Guitar, Vocals

2) Undercover was a UK based pop-house group who hit the UK #2 spot in 1992 with their Stock, Aitken, Waterman produced cover of Baker Street.