India is working on a treaty with the UK under the proposed Free Trade Agreement (FTA) to avoid double contribution to social security funds by Indian professionals working for limited time period in Britain, an official said on Thursday. Indian professionals working for a limited period in Britain contribute to their social security funds but not able to get its benefit as they return once the projects are complete. "We are negotiating the double contribution treaty with the UK under the FTA. There should not be any double contribution towards social security schemes," the official said. It is a long-standing demand of Indian businesses operating in Britain to cut down on the additional cost burden associated with bringing in skilled Indian professionals on a short-term basis. The compulsory National Insurance (NI) contributions of skilled Indian professionals in the UK on temporary visas remains an additional cost burden of about GBP 500 per employee a year, over and above all .