To confirm conditions have been satisfied you would need to make an application for a certificate of lawful development.
There is a website that will help you through this process. The website is www.planningportal.co.uk . You can make an application for a certificate of lawful development, and you can calculate and pay the fee for the application there too.
It may be that some of the conditions have already been satisfied and if this is the case the details will be listed on our website at www.sefton.gov.uk/planapps
It may also be helpful for you to read our guidance on what you will need to submit with your application. This can be found at https://www.sefton.gov.uk/planning-building-control/apply-for-permission/getting-your-application-right-first-time.aspx