I remember your referring to "Berkeley Square," Gothick, and I was intrigued enough by your comment to look into it. You're right that the film is not available in any format, more's the pity. Nor was it in the film archive where I was working either, though there was a photo file for it so I was lucky to see photo stills, and I found photos from the Broadway production, too (also with Leslie Howard). The movie was later remade as "I'll Never Forget You," also known as "The House in the Square," also not available in any format. Not sure if you've read the play, but it is available either from Dramatists Play Service or Samuel French, I forget which (both have websites). The 1795 DS storyline does share some general ideas with the play, though I'm not sure how direct an influence it would have been. As I recall, a young aristocratic man is obsessed with the past and with his ancestry, is transported to the 18th century, where he replaces his own ancestor living at that time. He falls in love with the sister of the woman he is supposed to marry, as I recall, and is disillusioned by the crudity and cruelty of the era and returns to his own time; the final scene indicates that he never forgot his love there. John Balderston, the play's author, based the story on an unfinished late work of Henry James, which I have looked at and can't comment on other than that the prose is nearly impenetrable as James' later prose became, and James only wrote up to the point where his protagonist goes back into the past. It would be interested to speculate that Henry James was the influence behind the 1795 storyline! In turn, I wonder where James would have come up with this idea of time travel, which isn't the sort of topic one normally associates with him. Knowing that James was an admirer and friend of H.G. Wells makes me wonder if he was influenced by something Wells might have written on time travel.
Interesting that H.P. Lovecraft was a fan of the movie. I've read three or four early Lovecraft stories now after first learning of him on this forum a few years ago. I know you've written about Lovecraft's influence on the Leviathan storyline, but don't recall which works that might have been. Would also be curious whether Lovecraft's affection for "Berkeley Square" influenced anything he wrote ... but I'm getting off-topic ...
-Vlad