LONDON (Reuters) – London marked the deaths of 72 people in a tower block fire at memorial services across the city on Tuesday, five years after a blaze that shook the nation and revealed widespread and fatal flaws in building regulations. On June 14, 2017, Britain woke to the news of its deadliest fire in a residential building since World War Two, captured in images of a 23-storey inferno that have come to symbolise the tragedy of that night and a quest for justice for the local community and relatives of those who died. A memorial service at Westminster Abbey in central London began the com…