The opera played was Tosca by Giacomo Puccini
The Marquis pub was the Marquis of Lorne in Cattel Road now called the Roost. Not far from St Andrews Football Ground
The actors playing Billy Kimber (Charlie Creed-Miles) and his accountant Roberts (David Dawson) were both on Ripper Street (2012-16). Creed-Mills played Horace Buckley, while Dawes played Freddy.