Mike MacKeith, head of property agent Colliers International’s central London division, has resigned to focus on new challenges. He will remain in his role until the end of the year. MacKeith said: “I have thoroughly enjoyed my three and half years at Colliers, but the time has come to move back to a smaller operation where I can concentrate on my clients. I wish Colliers all the best and I hope that I will continue to work with them going forward.” Colliers International chief executive Tony Horrell said: “Mike has made a significant contribution here heading up the central London team and we are very grateful for his efforts. He will remain divisional head until the end of the year and I am sure we will continue to do business with him in the future. We part as friends.”