It might not be good idea as it is not supported use procedure wwv_flow_api.remove_page.
I think it is best remove pages using APEX builder and then you can use also Advisor to check application integrity
Thanks for your response - apologies for now replying sooner.
I decided to remove the pages in the application builder and then implement the changes using an application export as suggested - went smoothly. I used the Advisor to check the application which highlighted some additional redundancy that I needed to take care of resulting from removing the pages.