LTI, a key part of the black cab industry, has made the appointment to help maintain its profile and track the debate on a number of issues.
Consolidated will work alongside the in-house public affairs team.
Among the current hot topics that will impact the industry are the congestion charge (from which taxis are exempt), proposals to license private mini cabs, the London Mayor's review of the vehicle spec for black cab drivers, and the Office of Fair Trading's enquiry into the licensed taxi trade.
Consolidated Public affairs director Ed Vaizey, said: 'It is a question of keeping an eye on the issues that concern them and trying to anticipate future issues. We will give them advice as and when required.'
'Black cabs are an important part of the continuing debate on the role of transport in the capital, the challenge is to maintain their profile with government and their image as a symbol of London,' he added.
LTI government affairs director Chris Kelsey said: 'There is a lot going on in a small specialised industry, so monitoring events is critical to us. In my role you are only as good as your intelligence. They will also be providing us with advice and helping as a sounding board.'
The agency will mainly work with the Greater London Assembly and the Mayor's Office, but also with central Government and the Scottish Parliament to a lesser extent.
The agency replaces PPS Group, which had handled the account for a year.
There was no pitch, but Consolidated was known to the client through its transport newsletter. The account will be run by agency director Ilan Jacobs.