There were no injuries to the prisoner or staff, and no damage to property.
Some farmers are worried there are no EVs, which could come with a rebate, to take the load they need to tow.
"People are starting to think about where their future is in the sector."
The National Fieldays is expecting over 120,000 visitors.
The DHB suffered a ransomware attack on May 18.
"These animals would have suffered greatly from the neglect [he] showed them."
Anyone with information is urged to contact police.
He died following a suspected medical event and there is no indication his death is suspicious.
"I can say that it was a sophisticated attack which was carried out by people intending to seriously disrupt our service."