I'm being creative here....
There is an article in today's Irish Times that says Ireland is the world's HQ for Hedge Funds administration. Back in the 80's, the London Stock Market loved people with numerate degrees. Maybe you could look in the IFSC for a job?
My current job involves dealing with a lot of logistics companies. I'd bet they need people to write models to get their lorries etc from A to B in the most efficient way. And since you know all about relativity..... (sorry, bad attempt at joke).
Sluice