@D.B.Moody has it! Nottingham High School it is. Founded by Dame Agnes Mellers with a deed sealed by Henry VIII, it is an independent day school that was boys-only from 1513 to 2015, when it became co-educational (21 years too late, if ask me...). And it is where I first learned about Gaius Plinius Secundus.
The stone is Bulwell limestone from the southernmost outcrop of the Cadeby formation. I initially though that it was Ancaster stone, as that is what nearly Wollaton Hall was constructed with. The main school in the picture was built in 1866/7 and a basement floor was added a few years later. Adding a basement floor to an existing building was very unusual for this era and was only possible because the school sits on a ridge of Nottingham sandstone that is very easy to excavate.
Legend has it that you could get from the trap door in the floor of Language Lab 2 into the caves of Nottingham, and down to Ye Olde Trip to Jerusalem (aka The Trip). However, despite our best efforts we never managed to do so.
And my west-coast double IPA is called "Canis in via est..."
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Spoiler: the dog also dies when Vesuvius explodes.