While the number of victims may not be absolutely certain, a figure of 71 victims is widely accepted. Non were illegal immigrants. Most victims died from smoke inhalation so their bodies were not incinerated and could be counted.
A list of victims is listed here.
http://www.independent.co.uk/news/uk/grenfell-tower-fire-victims-list-dead-presumed-killed-71-people-sir-martin-moore-bick-inquiry-a7945866.html
The Initial inquiry did not find droves of illegals, that is just in your prejudiced imagination. While some parts of London have a majority of foreign born residents, it is wholly wrong to assert that they make up the majority in the Capital as a whole. Of those that do live in London, the vast majority are here legally.
What is the answer?
You could start by getting your facts right, and not being a racist moron peddling lies.
For someone who professes to follow christian principles, your use of such a tragic event with a huge loss of innocents lives, is rather sickening. And telling.