These photos show filming taking place in Hounslow's Syon Park for the latest Transformers movie , starring Mark Wahlberg.
A huge lighting rig can be seen looming over the park's Great Conservatory, which was closed on Thursday (September 8) for what staff would only say was a "private event".
However, crew members have told residents and getwestlondon reporter Emily Chudy they were in the park to shoot scenes from the new movie on Thursday for one day only.
A sign near the film set also stated that filming was taking place for a 'major motion picture' by High Command Productions Ltd, and apologised for any inconvenience to residents or visitors.
Transformers: The Last Knight stars Mark Wahlberg, Laura Haddock and Anthony Hopkins, who have been seen filming elsewhere in London this week.
It is not clear whether any of them were present at Syon Park in Brentford on Thursday, though one member of the public was told Anthony Hopkins was believed to be on the grounds.
Syon Park's management has not commented further on the filming, other than to say the Great Conservatory and the park grounds were closed for a "private event".