MHRA has moved slowly, yes, but not irrationally slowly given the novelty and regulatory complexity of the case. They are balancing safety and precedent because approving DCVax-L opens the door to future ECA-based approvals. The trial may be cut and dry for you but its not for the real world because of ECA comparison without individual patient data, randomization of control patients to treatment and changing endpoints.
NWBO longs are too easily forgetting that the DCVAXL MAA submitted and the SAP/SPA its based on is controversial. The MAA submitted is being/has been so far, highly scrutinized (I heard that from my good source) and therefore until the MHRA approves DCVAXL, the market will consider NWBO a very risky investment.