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This two-hour 'walkshop' will introduce visitors to some ancient London greenery, including the ash tree which Thomas Hardy carefully stacked dozens of gravestones next to when he was put in charge of relocating the Old St Pancras graveyard 150 years ago. A photography workshop will start the event, then guides will reveal which nearby trees have been alive since before Hardy's London. The walk is free but guests must book ahead on the event page.