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Countryfile is in Shropshire. Its countryside is rich picking for some of Britain's finest homegrown foods. Matt Baker and Ellie Harrison head to the small market town of Ludlow for its annual food and drink festival. This place is up there with the best when it comes to all things local. Matt samples a few delights on offer at the festival, and he meets the farmer putting the county's native breed of sheep back on the culinary map . Meanwhile, Ellie finds out how rare breed pigs are giving our continental cousins a run for their money, and doing their bit for conservation too. Elsewhere, Tom Heap looks at the threat that non-native invasive species are posing to British plants and wildlife - and even to our own houses. But, as he discovers, some home-grown species also seem to be upsetting the delicate balance of flora and fauna in the countryside . And Adam is in Wales catching up with two sheep dog handlers representing Wales in this year's One Man and His Dog competition.