I have located Isaac in the 1871 census, 29 years old and resident in London. He was not included in the 1861 census so I have concluded that he arrived in uk sometime between 1861and 1871. He became a British subject in 1881 aged 29 years. I can find no immigration records for Isaac.
How can I find out when he arrived here?
I believe he lived in a place called "Walyraterlel"perhaps in what was then known as Prussia.