Manchester city centre is threaded with infrastructure that belongs to public bodies: Victorian railway viaducts, the Metrolink running through the streets, the main roads and the canals. A tower crane on a tight plot will often reach at least one of them, and each has its own process, its own lead times and its own conditions.
Those approvals can be the slowest part of preparing a site for a crane, so it helps to start them as soon as the crane positions are known and run them alongside the neighbour agreements, to one programme. What each body asks for, and the conditions it sets, are confirmed with it for the particular project.