This was despite 15 percent of the EU's spending in the region coming from its UK contributions.
According to RNZI, Roderick Drummond said modes of delivery would have to change but he said the UK and the EU have a shared vision for supporting development in the Pacific.
"The EU programmes that exist at the moment are very much things that, you know, follow, pursue priorities that we think are important as well, so how that will change when we are no longer part of things remains to be seen in years to come," he said.
"But it may be that there is not as much change as people think, except in how we deliver these programs."
However Mr Drummond said changes would have to be made from a UK perspective to trade deals such as the European Partnership Agreements being negotiated in the region.
The British High Commission in Suva also represents the UK’s interests in Kiribati, Tonga, Tuvalu, Republic of Marshall Islands and Federated States of Micronesia.