In a short answer NOPE...but to clarify.......in the studio all the vocals were all put down by their producer Frank Farian and the big guy mimed his way through every performance....as for appearing and being No2 live did anyone ever actually think that they were accomplished musicians? They were a bit fun and did a couple of good pop songs but i suppose it could be true.
I think his name is Bobby Farrell and he (and some other people never associated with the orginal band) still perform as Boney M, despite having been taken to court and served with a legal order to prevent him from doing so. Allegedly!