Transformers 5 Scenes Set During World War II

It seems we finally learned a new nugget of information regarding Transformers: The Last Knight. A few scenes will be set in World War II, specifically at the "headquarters of Adolf Hitler". Which will be filmed at Winston Churchill's home of Blenheim Palace, Oxfordshire. Knowing that Churchill's home will be dressed with "enormous swastika flags, a variety of German military equipment and SS stormtroopers filling the forecourt" is something that some UK residents are not happy with. “I know it’s a film,” Col Richard Kemp, the former commander of British forces in Afghanistan, told the Sun. “But it’s symbolically disrespectful to Churchill. He will be turning in his grave.” The home is owned by a distant relative of Winston Churchill so his approval is all TF5 production needs.

Michael Bay defended the filming decision saying "People have not been fortunate enough to read the script and they don't know that Churchill in this movie is a big hero. Churchill would be smiling. When you see the movie you'll understand."

This is the same location that Anthony Hopkins and Freya the dog were shown filming at. It seems to me that a portion of the film is about Wahlberg's character looking for an Arthurian artifact (Excalibur?) and he goes to Anthony Hopkins character for information to find it. With a few lines he then sets up a flashback sequence that will probably explain more about the McGuffin. Or Hopkins doesn't actually share a scene with Walhberg but just the location.

Is Hopkins playing Winston Churchill? Churchill was often referenced as a bulldog but actually owned a poodle, but I could see Bay purposely mixing his metaphors by using Freya. While Hopkins has been seen at least twice on TF5 locations set in "modern" times, the locations could easily be adjusted to be set in the 1940s. Has he actually shared scenes with actors (Walhberg, Tucci, etc.) set in present time or is he on set doing scenes in the past while the rest of the cast use the same location to "follow" in his footsteps?