Click on Scrapbook/Show in Sidebar
Once it's showing in the sidebar, you will see some little icons at the top, one of which is a folder with a plus sign
Click it and select Create new folder. Give the folder a name such as "NHS", "Police", etc.
You can drag any of your existing entries into suitably named folders.
You may close the side bar (or replace it with your bookmarks or history) if you wish.
In future when you click on Scrapbook from the main menu, it will list the folders.
When you highlight a particular folder, a menu will pop out showing the existing entries, plus for each folder, there is a Capture page option, which means you can capture a page directly into that folder.
If you capture to the wrong folder, you can easily drag the entry to the correct one by opening the scrapbook in the sidebar (see above).