Pre planning application advice is not mandatory, but it is an encouraged part of the planning process. This is because it can lead to the identification and solving of any issues with your development proposal before you submit your application. This could save time and money in the long run.
Some of the things you may find from using a pre planning advice service can include: what policies your development will be assessed against, development site planning history, important constraints, and designations the site has, what supporting documentation and information you will be likely required to produce to support your application, and more.