Usually the most reliable tool for a search of vital records in England and Wales is at freebmd.org.uk.
You say you have a record for "Henry Sands" birth at St George in the East in July 1905. There is no such record either on FreeBMD or on Ancestry. Please tell us what you are relying on. What else do you know about the family?
There is a Harry Sandperl born Jul/Aug/Sep 1905 St George in the east C Vol 1c Page 304. Is there any chance that this could be the person you seek? If there is, there is a birth and death for a Rachel Sandperl in 1907 and a birth of a Millie Sandperl in 1912 (with a mother Krasnabret). The 1911 census shows them as Sandpearl - Simon and Rebecca (both born Russia Warsaw) with children (the older ones born in Warsaw) inc Harry aged 5 and mother in law Krusnabrot. But Simon and Rebecca die in the 1950s. So all in all, probably not who you're looking for. I can see no Henry Sand* in the 1911 census that could be plausibly yours. Apart from Sandpearl in the 1911 census there is a Harry Sandle of the right age with a mother Rebecca in Bethnal Green and no father living with them. She seems to die in 1912, so perhaps this is the family?
To find Jewish burials in London there are two main sites:
- for the Fed there are lists for the Edmonton and Rainham cemeteries at https://www.jewishgen.org/jcr-uk/Cemeteries/Federation/Rainham/INDEX.HTM.
- for the United at https://www.theus.org.uk/category/find-grave you have to search by cemetery, given and family name. So, for example, search "East Ham" simon, sandpearl and there he is.
Most of my East End relatives were buried at East Ham or Rainham until the community moved further out.
Many of the Jewish institutions have merged over the years. You might therefore want to start with Jewish Care and Norwood, but you may want to wait until the lockdown is over.
SHADUR, SADUR, SHADER, SADER, CHADOUR, SADOUR, SHADOUR, SZADUR from Salakas, Lithuania
MINDEL, MINDELL from Utena and Vyzuonos, Lithuania
FELLER from Pabrade, Lithuania