Three decades ago, he left his home on Merseyside to live near the wall so he might better be able to study it. In 2016 he and his family travelled 15,000km (9,320 miles) around the wall network, filming it from the air with a drone.nnMr Lindesay and his sons, Jim and Thomas, spoke about their epic journey and how they shot it.nn(Source: BBC News YouTube channel)
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