Building work at the Paxcroft site near Trowbridge Rugby Club has been suspended while police investigate the accident. The site is managed by Ashford Construction.
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Early showers should clear to leave dry spells overnight.
There could be some thundery showers in the east this evening, but it will soon become dry and clear.
A crowdfunding campaign is well underway to try and save the landmark that stands next to the M5 in Somerset.