Dear Miss C,
I wasn't aware that escort services were pro-cyclical, but I shall take your word for it. You have three options, none of them perfect.
One: relocate. Canary Wharf is a pure banking play, and you could seek a more diversified market. The West End is full of hedge funds, oil barons and old money. However, I recognise that it will take some effort to find new clients. The economist Steve Levitt and sociologist Sudhir Venkatesh discovered, in a recent analysis of Chicago street prostitution, that the industry was very concentrated because prostitutes and clients would otherwise fail to find each other. You, of course, are not in quite the same game and may be able to relocate with ease.