Families of those who died have reflected on the "cold, calculated and cruel nature" of the attacks in Bali at a memorial in London, in front of a wall which bears the names of the 202 victims.
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Bodies are being buried in backyards and overwhelming morgues as officials try to find another plot of land to lay them to rest.
Authorities have warned that the death toll is likely to rise as much of the building is yet to be searched.
The PM will sound out the possibility of new free trade agreements with Gulf states for once the UK has left the EU.