Geezer, you must be a rare exception.
I work in the Square Mile, in one the UK's ever-popular investment banks. I wear black monkstraps on occasion but very rarely see another pair. What I do see are lots of square-toed loafers and the occasional pair of ridden hard, put away wet Derbies.
Having worked in the City on and off for the last twenty years I can confirm its reputation for any sort of male sartorial elegance is grossly inflated.
The best dressed City workers...