Don't know if this will reach you after all this time, but fingers crossed.
Rosa Maria Sitch (Nee Rumary) was the eldest sister of my maternal Grandmother, Emily Jane Rumary. I remember Sid Sitch from when I was a young lad - sure he rode a moped, as I remember him with one of those old leather crash helmets. Think he was an agent for The Liverpool & Victoria.
Geoff Kennell