wrote

Also when did pre-Thameslink-revival passenger services stop running
over the Farringdon to/from Southern Region section, what services
were latterly provided and by which BR Region(s) - or if pre-BR which
Railway Company(ies) provided the services?

1908. Services had been provided by the Midland, Great Northern, London
Chatham & Dover and South Eastern (the last two came together in the South
Eastern & Chatham Railway Management Committee in 1899 - before then South
Eastern trains were not allowed to call at St Paul's (Blackfriars), Ludgate
Hill or Snow Hill). London and South Western Railway trains ran as far as
Ludgate Hill in passenger service, and continued to Snow Hill sidings to
reverse. SE&CR trains to Moorgate Street via the Snow Hill to Aldersgate
curve continued until April 1916, and trains from the south ran as far as
Snow Hill (by then known as Holborn Viaduct Low Level) until June 1916.

Peter