Not enough detail here, but if the other side that is doing the selling is dealying tactics you had better advise them of this. If the delays are from your Solicitor's side, you may be better off asking them are they able to handle the task ?? Surely it is a case of surrendering the leases on the grounds that the freehold purchase is complete. Are the Freeholds / leaseholds owned by a developer or a County Council. If it is the latter, they are incredibly slow.