The UK Independence Party has won its first council seat in Surrey after Chris Browne triumphed in the Foxhills by-election in Runnymede, although the Tories described the result as a "one-off".
Councillor Browne admitted he was "stunned" after beating Conservative candidate Barry Pitt into second place on Thursday night, in the process overturning a 24% deficit suffered by UKIP in the 2012 local elections.
A UKIP spokesman confirmed: "This is the first time we have won in Surrey straight."
Only 18 votes separated Cllr Browne and Mr Pitt - 336 votes for UKIP (40%) and 318 for the Conservatives (38%). Labour's John Gurney came third with 181 votes (21%).
When asked for his reaction to the result, Cllr Browne said: "Stunned. I suspected it was a possibility but thought it would be more of a close-run thing rather than a win.
"I don't know who was more shocked, me or the Conservatives."
Cllr Browne is now the only Runnymede Borough Council member to represent a national party other than the Tories, who have 35 councillors. There are also six Runnymede Independent Residents' Group councillors.
The Tories described the result as "disappointing" after seeing a 24% lead in 2012 dramatically reversed into a 2% deficit.
Cllr Paul Tuley, chairman of the Chertsey Town Conservative Association, said: "We are happy to admit a disappointing evening, losing a ward we have held for many many years.
"I think in future elections we wouldn't see UKIP being as successful. I think it will very much be a one-off."
Labour Party member Lee Godfrey said the stagnation of their vote in the ward was not a cause for concern.
"We are strategically focused on Chertsey," he said.
"If circumstances were different and this election was in September along with the other two by-elections, we could have made an impact."
The Foxhills by-election was called following the death of former Tory councillor Frances Barden in December.
The council said turnout was 19.41% with a total of 838 votes cast.