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"We've been appalled by the inhumane violence that's taken place in Rakhine State. It's a major humanitarian crisis. It's been created by Burma's military and it looks like ethnic cleansing," the spokesman said, using the traditional name for the country.
"Burmese authorities need to stop the violence and ensure access into Rakhine State so that UK aid can provide a lifeline to those who are suffering there."
Accounts of horror
More than 615,000 Rohingya refugees have fled the country since August 25, according to aid agencies, pouring into neighboring Bangladesh, which has struggled to deal with the influx.
Many of the hundreds of thousands of Rohingya refugees who have escaped Myanmar have told of mass rape, murder and arson.
In an exclusive CNN report this week, refugees described surviving atrocities and horror before reaching the relative safety of the camps.
"In the pile there was someone's neck, someone's head, someone's leg. I was able to come out, I don't know how."
British connection
Myanmar's de facto leader Aung San Suu Kyi's father helped negotiate the country's release from imperial control, and she was educated in the UK and married to a British citizen.
Earlier this year, the UK said it would suspend its training program for the Myanmar military because of the violence in Rakhine State "until there is an acceptable resolution to the current situation."