Councillors in Bexley and Bromley have refused to sign an agreement to the ULEZ expansion amid deadline threats. 

The Conservative-run regions are part of the four councils, including Harrow and Hillingdon, that have told the Mayor of London Sadiq Khan that they are "strongly opposed" to expansion plans. 

It comes as Transport for London (TfL) wrote to the councils giving them a deadline to sign the agreement of February 2, however, all councils refused to agree. 

Instead, the group shared a joint statement, sharing: "Bexley, Bromley, Harrow and Hillingdon councils will not sign the Section 8 agreement with TfL while legal advice is being taken.”

Why are Bexley and Bromley opposing the ULEZ expansion? 

The southeast London boroughs have both refused the ULEZ expansion over 'serious concerns'. 

In a shared statement previously released, the councillors said they are "not satisfied with the justification for the expansion and remain strongly opposed to it."

Adding: "It remains our position that this scheme will not translate successfully to outer London and the negative impact to local households and economies will far outweigh the negligible air quality benefits."

Following the group's refusal to sign the expansion agreement, TfL confirmed that it has the legal powers to override the councils’ refusal, but they would prefer to have their consent.

READ MORE: Martin Lewis calls ULEZ expansion 'tough' as he clashes with Mayor Sadiq Khan

By signing the agreement, the local authorities would have a say over the design and positioning of new cameras and signs.

A TfL spokesperson said: “The Mayor has been clear that with 4,000 Londoners a year dying from toxic air, his decision to expand the ULEZ should be implemented with minimal delay.

“In doing so we are working closely and collaboratively with all boroughs concerned to install the infrastructure needed.”