Pressure is mounting on Wellington councils to join a panel looking at whether the region's local authorities should merge and become a 'supercity'.
The panel, headed by Sir Geoffrey Palmer, has been set up by the Greater Wellington Regional Council, but only the Porirua City Council is taking part, while the Kapiti Coast District Council has been in talks in the past week.
Other councils are being urged to join, with Greater Wellington's acting chairman Peter Glensor confident everyone will eventually see the benefit of at least discussing the 'supercity' option, than ignore it.
"Once people read the terms of reference for the panel, it's really clear that it is an independent panel and they're charged with coming back to us with their thoughts."
The panel is due to report back with its recommendation by November.