This week we visit the World Food Garden at RHS Wisley to see how new eco-friendly ways of growing are taking shape. Guy Barter gives his expert guide to brassica growing for bumper crops of Brussels sprouts, kale and kalettes next winter. Plus a fond farewell to Sue Biggs CBE, who's been Director General of the RHS for the last 12 years – hear her reminisce about some personal highlights and a close encounter of the royal kind...

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