Scrapes this page
from the NHS TRUD website for all available items. The item_number column
in the result contains the identifiers you need for get_item_metadata()
and download_item().
Subscription Required
You must subscribe to TRUD items individually through the NHS TRUD website
before you can access them using get_item_metadata() or download_item().
Simply having an API key is not sufficient. To see items you're already
subscribed to, use get_subscribed_metadata(). To browse all available
items, use trud_items().