It's hard now to think back but the early B's had two fuses as I recall, which later increased to four, perhaps on the offside inner wing. It always amused me that some of the wires going in were a totally different colout to those coming out. It just made no sense.
The black spade covers are likely to be the originals. That was the BL style in period. That is a masterpiece of "making do".........................
