It is a lovely group. Britannia rises on a winged seat, flanked by Mercury (representing Commerce) and Truth with his torch.
At Britannia's knees are crouching nude females representing Higher and Lower Mathematics. Higher Maths, on the left, holds a carved 'magic square' a grid of numbers, almost any four of which add up to 34, the number associated in astrology with Jupiter. The square features in Durer's famous engraving Melencolia I and in Dan Brown's recent extrusion, The Lost Symbol.
The symbolism oozes with irony today, after a decade in which the financial sector cynically abused mathematics to loot the world, then hid the truth until economic meltdown was just days away and Britannia was close to ruin.
The building was adorned at ground level with serenely classical statues symbolising financial virtues, by Sir Edwin's favourite sculptor Charles Doman.
The figures on the Prince's Street facade represent Security and Prosperity.
Security is a veteran soldier wearing a Phrygian cap (for Liberty) and a pauldron or shoulder-plate with an embossed lion's head. He holds a key and a bridle, and stands on books and scrolls.
Prosperity is a graceful girl with one foot on a cushion and holding some fruit from a basket on an ornately-carved bracket behind her. A wreath and more scrolls lie at her feet.
Integrity is venerable man with a beard, holding a locked ledger and standing on a pile of more ledgers. The light of truth is at his feet.