Yes i did it with my block of 40 flats so we could get control of the service charge. The leasehold advisory service were very helpful in advising what we needed to do. You can make an appointment to speak to them for free. In short, it involved us having to get atleast half of the block on board, signed a form to say they approved us managing the block. We had to appoint certain roles, director, treasurer etc so atleast 2 active members in the block involved in the management of it. That gave us control of which suppliers we wanted to use for repairs, cleaning etc. Best thing we ever did. Worth mentioning though, we chose to keep the property management company on to do the admin side of things (collecting service charges, liasing with suppliers) as its a big task. We just dictate which suppliers we want to use and approve or reject costs as we see necessary.