That visit also included tours of some of the stadiums that form part of England's bid - Old Trafford, City of Manchester Stadium, St James' Park and the Stadium of Light and gave the Fifa delegation a chance to inspect transport, stadiums and security.

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But because it requires open, light conditions to thrive, park managers need to fell trees to protect it.

BBC: Campaign to protect rare lichens in Pembrokeshire

The robots currently are being assembled at QBotix headquarters in a non-descript building in a light industrial area of Menlo Park.

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