A park will be restored “as quickly as possible” after a “massive” film crew packs up.
Neighbours have spotted the ongoing production at Knutsford Playing Fields this week, as speculation abounds over what is being shot.
However, Watford Borough Council has also been made aware of "concerns" over the current condition the land.
A spokesperson said: “Once the filming unit has departed on Tuesday (June 9), we will carry out an inspection and ensure any damage caused is addressed as quickly as possible.
“Hertfordshire has a thriving film and television industry, which brings significant investment to the local economy, supports jobs and local businesses, and helps showcase the county as a great place to live, work, and visit.
“New figures released by Hertfordshire County Council show productions brought an estimated £29.1 million of economic spend into the county during 2025/26 – more than double the previous year.”
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A previous round of filming took place between May 31 and June 2, with the latest work then starting up on Thursday (June 4).
Park access for the public has been maintained throughout.
Those who have seen the filming underway describe it as a "massive" operation and shared guesses as to what is being filming, including the upcoming Guy Ritchie movie Wife & Dog - set to star Benedict Cumberbatch, Rosamund Pike, and Anthony Hopkins.
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