Tony, that would make sense if probate or the construction of wills was a necessary part of the Bar final examinations. It is not. Indeed, it might not be one of the six optional subjects but, as yet, I haven't discovered what they are.It is not at all likely that such a skill is taught in the Law Degree, being a practical skill and subject rather than a purely legal one.
The question asked is on that very topic, and there is no reason to believe that a 'newly qualified' barrister knows about it.
But I'll bear your comment in mind when I am asked £5,000 for an hour's conference with a QC, as I have been, or senior junior. A newly quailified man, say of a year's call, would be much cheaper and will know just as much, won't he or she? :)