After completing MSc (Mathematics) you can work in the Government Statistical Service, pharmaceutical industry, the National Health Service, local councils, insurance companies, market research and marketing companies, banks, accountancy firms, universities, colleges and schools. Following types of the jobs are suitable for you:

Quantitative Risk Analyst
Equity Quantitative Analyst
Director Statistical Programming
Managing Editor - Computer Science and Mathematics
Interest Rate Trading Strategist
Director Statistical Programming
Quantitative Developer
Mathematical Analyst
Assistant / Associate Manager - Mathematics
Mathematics Specialist
Assessment Developer - Mathematics
Mathematics Subject Matter Expert