Just wanted to go back to this as it is fairly coincidental, David Alter newspaper article from I believe mid 90s? His address is listed as "Ashlake Road, Streatham"
The address for this 'I Alter' (possible Father) is from 1984? and these two addresses are 1.2 miles apart
For the 'I' initial, there's really not many options for what this name could be, the only possible English name would be Ian.
Other than that it would be foreign names like Ibrahim/Isaac (popular names in Kenya (where I believe he is from)
Only other options would be Ivan, Immanuel, Ismael.
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Annoyingly I don't believe he has ever mentioned anything about his parents, but I'm of the strong belief his father is either Kenyan/Israeli with a French/Greek mother.
He has however mentioned being mixed race, pro-immigration stances, he has mentioned about Kenyan schoolboys being taller than average, and links to worldwide church of god who have endorsed british-israelism + Alter surname connection to Jews
The only problem with this lead is that the 140a New Pk Rd address is a very nice house that would not be cheap, which is a big difference from the council flat at Kerrin Point he would have lived at prior. So unless his Father was wealthy and left his Mother during Davids childhood, this wouldn't make sense.