Why Is the Case of Woolmington V DPP So Important

Why is the case of Woolmington v DPP so important? See Woolmington v DPP (1935) for further details.

A) Attempts to acknowledge the inequality of bargaining power
B) It held that the burden of proof is on the defendant in all criminal trials
C) Acts as an essential safegurard as the resources of the state far outwiegh those of the accused
D) It states that the burden of proof on the proseuction is beyond all reasonable doubt.