LONDON — Members of the royal family were there, including the heir to the throne. Prime Minister Theresa May was there, as was her chief political rival, Jeremy Corbyn. The BBC broadcast it live to the nation.

The devastating fire at Grenfell Tower in London occurred six months ago, but an emotional memorial service for its victims at St. Paul’s Cathedral in the city on Thursday made clear that the tragedy continues to resonate far beyond the North Kensington neighborhood where 71 people died.