The court martial papers make reference to the house as No 7 Berkely Square, rather than Berkeley.
At 1:01 when Royalty from India are guests in the house, the date is announced as 1877. The music played is Ketelbey's "In a Persian Market". Ketelbey composed this piece in 1920 & it was published in 1921.
The bunny hop was introduced after WW2.