Gardeners' World has something for those that are interested in the Olympics, something for those coming to London and something for those who are happy staying at home. Rachel de Thame gets a preview of the gardens in the Olympic Park and meets those who have battled the elements to make sure they are at the peak of perfection. Carol Klein discovers London's wild side, exploring a community garden in the centre of the city that provides a haven for both flora and fauna. Joe Swift walks the paths of power. On an exclusive visit to the historic garden at 10 Downing Street, he learns of the changes made by successive Prime Ministers. And Monty Don is busy at Longmeadow, sowing late summer salads, harvesting blackcurrants and advising us on how to feed our flowers to maximise longevity.