You're welcome.
By the way, five anecdotes:
My nephew, with an Oxford 2.1 in classics and a GDL, took two rounds of applications to obtain pupillage. He is now a tenant at a good mixed civil and crime set.
Another nephew, with an Oxford First in Law and a BCL, obtained pupillage in his first round of applications. He is now a tenant at a well known public law/human rights chambers.
A friend recently obtained pupillage at a good Commercial/Chancery chambers but this took him three rounds of applications. He has an Oxford First in Modern History and an LLM/GDL. He also has a slightly awkward personality, and I think he didn't interview well at first.
I know two people who struggled to obtain pupillages in the nineties and noughties (one is an British-African-Caribbean man (Bristol), the other a British-Indian woman (KCL)). They each started in poor quality chambers. They have moved several times. One is now a Silk in a Magic Circle set, and the other is a rising junior in a good mixed chambers, an arbitrator, and is thinking of applying for Silk.