This appears to be a fake company used to sting MPs and Peers:

“Coulton & Goldie Global helps you achieve your boldest ambitions by overcoming reputational and relationship obstacles.” It is PO box in Zurich. Their phone number is no longer connected. 

This is the one believed to be used by the Telegraph/Panorama that Mercer is said to have signed a contract with:

A simple few clicks should have shown Mercer these were fake companies…