@chopc
As far I am aware, he did the barristers' qualification course (BPTC) after his GDL (not now current advice) and then did the MLaw in the year before he started pupillage. So although he is in the same school cohort as DD, he had time for the MLaw (and he is very bight!) whereas DD did a 4 year undergrad, the GDL, then BPTC and then straight into pupillage because she obtained hers whilst on the GDL.
One thing I will say - this career takes organisiation and planning. Failure to get what you want is often down to a scattergun approach and not matching your ability and interests with the right chambers. It is important that barristers get financial scholarships from their Inn of Court. This is the first indicator that their peers think they are the next generation and are likely to succeed at the Bar.
As a result, DC definitely need to decide which route at university when doing undergrad degrees for the best outcomes - I think. Solicitor or barrister. Leaving it late, not doing mini pupillages (DD was interviewed by 2 of hers) and not having the best cv you can get might seem marginal but it all adds up. (See my ball organisation comments earlier - she was asked about this!!)
Encourage DC to go to careers fairs, network, look at interests that matter to them and are useful on the cv etc.