I have posted this photograph from the Mick Twyman archive for paddle steamers historians. It is the 2nd June 1923 and it is a gathering of the Mayor of Margate, Town Councillors , Directors of the Margate Pier and Harbour Company and the board members of the General Steam Navigation Company commemorating the 100th year anniversary of the GSNC and services to Margate.
The "Royal Sovereign" at the Jetty 1928
Same with this paddle steamer not sure if this GSNC , however it is impressive photograph given the size of the steamer to the jetty. It does make me wonder how they managed to berth.