The Temperate House at Kew Gardens was due to shut because of its deteriorating state. However, multi-million pound grants from the Heritage Lottery Fund, Department for Environment, Food and Rural Affairs and private donations means a five-year restoration scheme can now go ahead.
The 150 year-old Grade 1 listed building is home to the South African Cycad and the Chilean Wine Palm, the world's tallest glasshouse plant.
Martin Stew spoke to the Head of Glasshouses at Kew Gardens, Greg Redwood.
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Acting Commissioner Craig Mackey led new policemen and women in paying their respects at a passing-out parade in Hendon, north-west London.
The tour of European capitals was timed to coincide with the start of the Article 50 process to exit the EU.
The Football League will introduce the project if the family of PC Keith Palmer supports the idea.