UK competition authorities are becoming increasingly interested in the activities of property owners and developers; their agreements, joint ventures and commercial practices. Focuses on UK competition law and the merger rules in particular but excludes EC law. Considers restrictive agreements and anti-competitive behaviour practices by dominant firms following the introduction of the Competition Act 1998 in March 2000. Looks at a recent OFT investigation into two online property search providers, who were accused of operating at predatory levels and excessive charging but did not infringe the Act because their market positions were not dominant. Examines mergers under the Enterprise Act 2002, which can catch property transactions and suggests that the OFT is more likely to investigate property deals that trigger the share of supply test. Lists the remedies and penalties available to the competition authorities and also basic guidelines for in-house counsel.