Become EPSRC program manager and show your former advisor who the boss is :-))
Other opportunities involve
- administrative or purely teaching jobs at universities,
- teaching Maths in a private school, -
- jobs in academic publishing,
- research jobs in industry (IT, petrochemical, pharmaceutical),
- spying (GSHC or KGB - have you heard of Anna Chapman?),
- law conversion (solicitors specializing in IP),
- other businesses (actuarial, treasury, accounting - requires a training contract).