It's perfectly acceptable to descend below DA during a go-around, and physics dictates it's inevitable when the go-around commences at DA. However, over the years there has been a divergence in policy between the CAA Flight Ops departments with regard to testing, with the RW section requiring the go-around to be initiated at DA to DA+50ft and the FW section simply stating DA - like what airlines actually do in the real world! You can see the difference if you look at Standards Docs 24(A) and 24(H). So, in the testing arena, you will see candidates being conservatively coached, and then flying the go-around within 50 ft of the DA, which at lower speeds may result in the aircraft not actually descending below the DA at all, leading to the impression that this is the desired outcome. It then becomes a cyclical myth......
Jayteeto think you hit the nail on the head!
DA if QNH and the equivalent DH (in brackets on the plate) if you fly QFE.
Whilst factually correct, most Jeppesen users globally are FW operators, and their pilots probably wouldn't know what QFE was if it dropped on their heads! Hence, my suggestion that knowing what the DH and MDH are is far more relevant to the cloud ceilng/base, rather than a quaint little habit that the British are fond of!