The Lagan Valley MP becomes the party's fifth leader in its history, and third in 50 days.
Sir Jeffrey said he had spent the last few days "talking quietly" to party members, including the man he replaced as leader, Edwin Poots.
"I think that's been good, it's been cathartic for the party and I think there is now a united determination. On Saturday, the Lagan Valley MP received the backing of 32 out of 36 votes from the party's electoral college.Mr Poots confirmed on Wednesday that Sir Jeffrey had his full support and that he had given him his backing in Saturday's leadership vote.
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