Black Magic was a division of Selecta Disc( Brian Selby) and distributed in the UK at the time by CBS(Sony). John Brattan was label manager and although short lived, they had pretty heft sellers including The Sharonettes(60,000), Dobie Gray(10k plus)
and various similar follow ups all achieving healthy numbers.
The scene had peaked by around 77 with the label trying different things ie Jill Baby Love and The Funkees.
The label folded but the record store flourished in the new emerging indie market and stayed at the forefront, until the untimely death of founder and owner Brian Selby.