The Government needs to 'go back to the drawing board' and re-design the visa system for seasonal workers in food and farming. That's according to researcher, Dr Lydia Medland from the University of Bristol, who says the current scheme leaves both workers and operators vulnerable. 45,000 visas are available this year for people to come to the UK to work on farms or in food processing. Last week we reported that one of the 6 firms which operates the scheme has had its licence revoked - the Home Office wouldn't tell us why and the company says the revocation is unjust and is considering appealing. We hear how species re-introductions can be used to restore ecosystem services like pollination or nutrient cycling. And Asia and North Africa are the most exciting emerging export markets for British livestock farmers over the next decade - according to a new report published today by the industry body AHDB. Presented by Charlotte Smith Produced for BBC Audio in Bristol by Heather Simons