Thanks for reminding us, Bruce.
A hundred years is a long time ago, but we should not forget.
If one looks up the event on the internet, you will find statements like "The funeral and burial in London of the anonymous British serviceman killed in the First World War was the biggest outpouring of grief the country has ever seen" (Mirror, 2014)
I know some people do not like wikipedia, but at least it gives you a starting point to read up on the event:
https://en.wikipedia.org/wiki/The_Unknown_Warrior
LEST WE FORGET