Hi, I have been away from my search for a few years (approx 5). My Father passed away and the joy went out of the hobby for a while but now I am ready to start the never-ending quest again

On the 2nd of February 1909 Alfred Piper joined the 11th London Rifles and was introduced by a Rifleman Piper 225 and I am trying to find out who he is. My earliest Military record is this one and his brother joined the same regiment in 1914 so it wasn't him. His father was dead so I would really like to know who RFM Piper was as it will help me with finding out who he knew on the Piper side as his father died when he was only 4.
Could anyone help me with my search? has there been any military releases in the past 5 years that may help? Popular Piper names at that time in the family were John, James, Alfred, Arthur if that helps