The Conservative group split in half last night after a shock meeting in which the ruling Labour party were left with little opposition.
Councillors met for the first time at Brent Civic Centre on Wednesday since the election which saw Labour romp to a victory.
While the purpose was to herald in Councillor Kana Naheerathan as the new mayor and pay tribute to the outgoing Bobby Thomas, the show was stolen by the six Conservatives who confirmed they were splitting into two groups of three after a dispute.
The three Brondesbury Park councillors have now broken away from the Conservative group, forming Brondesbury Park Conservatives, comprising of Councillor Carol Shaw, Councillor John Warren and Councillor Joel Davidson.
Conservative Group deputy leader Reg Colwill said: "I've never been so disgusted in my life. As soon as they got elected, they walked in and said 'we want John Warren to be leader', and Carol [Shaw] to be his deputy.
"We told them there is an AGM process that was coming up, but they threatened to split then and there. They are never coming back to the party, no chance."
Mr Warren refused to comment to getwestlondon, but a local party activist said they hope it will be resolved soon through a mediation process.
At the AGM, the six-strong group voted to keep Mr Colwill as deputy leader and Councillor Suresh Kansagra as leader, with votes going three to nil as Mrs Shaw, one of the Brondesbury Park rebels, was on holiday so the other two members did not attend.
This leaves the Conservative group with only three councillors - those representing the Kenton ward, with Labour dominating elsewhere.
A Brent Labour source told getwestlondon: "This is petty from where we are standing, and it could come at a cost to the taxpayer.
"It seems to all be driven by who gets what position in the group, and no real policy differences.
"Whatever they are going to do and however they are going to sort this out, they need to do it quickly so they can get on with being councillors."
It is understood that all allowances between the two Tory groups will be split, and that the warring parties will share a political assistant employed by Brent Council.
After being decimated in last month's local elections, the Liberal Democrats are down to one councillor.
A Brent Council spokesman said: “The council has recognised the Brondesbury Conservatives.
"It is an unusual situation and we are considering the implications.”
