By Katy Lewis and Will Durrant
BBC News, East & the Local Democracy Reporting Service
A council has refused permission for Watford Football Club to keep its 22-metre high (72ft) high training dome.
The club received planning permission in 2017 for a temporary inflatable dome at the London Colney site on condition they deflated it between April and October.
The Hornets had since applied to keep it permanently.
Hertsmere Borough Council said it was considered to be inappropriate development in the green belt.
Council officers told the planning committee the white fabric structure, which covers an artificial pitch, did not comply with local and national planning rules.