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Blowing hot and cold

Alan Titchmarsh is in the snowy Scottish Highlands looking at Ben Nevis, the highest peak in the British Isles at just under 4,500 feet. Not only is it stunning, but it is also the coldest and snowiest place in Britain. But if you head south you find a world more like the tropics - the Isles of Scilly, with their white sands and turquoise blue seas. Coconuts are sometimes washed up here, having floated over from the Caribbean on the Gulf Stream, the warm ocean currents that bathe the British Isles. This is why the Scilly Isles are frost-free in winter and scorching hot in summer.

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