 UKs competition regulator said on Thursday it will conduct an in-depth investigation of ticket reseller Viagogos 4.05 billion deal for the ticketing unit of U.S. e-commerce company eBay Inc. The Competition and Markets Authority CMA said the proposed undertakings offered by Viagogo and StubHub were not a clear-cut solution to address the concerns the regulator had raised regarding the acquisition. Viagogo said it will continue to work with the CMA during phase two of the review, while Stubhub did not immediately respond to a request for comment. 