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Around ten non-native species turn up in the UK every year. Recent arrivals include quagga mussels and killer shrimps. Not all are damaging, but some non-native species are invasive and disrupt existing eco-systems. Farming Today starts a week-long look at how much of a threat they are - both to native plants and animals, and to biodiversity worldwide.

A laboratory which will hold some of the world's most contagious livestock viruses has opened in the UK. The National Virology Centre at the Pirbright Institute in Surrey has cost 拢125 million, and will be a centre for research into diseases such as avian flu and African swine fever. Farming Today gets a tour of the lab, just before it went into secure lock-down last week.

And we meet the Welsh farmer experimenting with plantain as an alternative food source for his lambs.

Presented by Charlotte Smith and produced by Emma Campbell.