Sky News has learnt that Buckthorn Partners LLP has submitted an offer for Amey plc as part of an auction being organised by its Spanish parent company, Ferrovial, S.A. (BME:FER). City sources said that Amey could be worth between £300m and £400m, although uncertainties over its complex web of public and private sector contracts could mean the final purchase price falls outside that range. Acquiring Amey would represent a diversification for Buckthorn, which is competing with at least one other, unidentified, bidder. Ferrovial decided earlier in 2021 to relaunch an auction of Amey, two years after a previous attempt to sell it was abandoned. The Spanish infrastructure group has contemplated a sale of its entire global services business for some time, with Amey the subject of a standalone auction process. Morgan Stanley is handling the auction of Amey. Amey and Buckthorn declined to comment.