It was on the BBC world news and text. FWIW the Times on line edition is yet to report it at all The national TV news serves their audience and very few are interested in a story that boils down to:
"yet another in the endless series of Iraq internal bombing, no Britons anywhere near and death toll less than in other incidents"
Boston is news because it occurred in a society convergent to ours at an event Britons were participating in.