Sri Lankan High Commissioner to the UK, Manisha Gunasekera, confirmed the increased death toll on Monday morning. It was initially thought five Britons had been killed in the attacks.
Authorities say 290 people have been killed and around 500 injured in the attacks on one of the most important dates in the Christian calendar.
Eight explosions took place – three at churches, three at luxury hotels, and two further blasts later on Sunday – six of the blasts took place in the capital, Colombo.
Some 13 people have been arrested in connection with the attacks so far but no group has claimed responsibility for the attacks.
Police have also seized a vehicle they believe was used to transport the suspects into Colombo, and have also found a safe house thought to have been used by the attackers.
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