There are different ways you can structure your joint campaign:
you can be working with other campaigners as an ‘ordinary joint campaigner’
you can be involved in a joint campaign as either a ‘lead campaigner’ or a ‘minor campaigner’. We call a campaign that has a lead campaigner a ‘lead campaign’
your joint campaign could be a combination of the two
The way you structure your joint campaign can affect which spending counts towards your spending limit, and what you have to report.