In fact, it is the heraldry of the Pearl Assurance Company, who built it in 1956, and was the creation of Bainbridge Copnall. The architects were T.P. Bennett and Son, who occupied it themselves for many years.
At the top is St Margaret of Antioch, whose name in Latin, Margarita, means pearl. She holds a gigantic pearl in her right hand and the martyr's palm in her left - she was devoured by Satan in the form of a dragon, who lies beneath her feet looking a bit grumpy.
The other symbols relate to places associated with Pearl Assurance. The swords are the City of London, and the covered cup is St Dunstan, the patron saint of Stepney where the company had its first office. The wounded hind is St Giles, of St Giles in the Fields, the local parish.
Other symbols are the sun and a star, and the elements, air, fire and water.
The artist has not included Pearl Assurance's motto, Damus Plus Quam Pollicemur (We give more than we promise), which is a shame because then I could have given you a poem written by some unsung South African employee way back:
Upon the dragon's back for years
St Margaret bravely hid her fears.
A most precarious place to stand
And hold a pearl in outstretched hand.
But Margaret has no need to worry
For if she jumps off in a hurry,
And slips perchance and breaks a femur -
DAMUS PLUS QUAM POLLICEMUR.
Many thanks to Jo French, information manager at T.P. Bennett, who dug out this information.