UKPressOnline has extended access to the Advanced Search Functions of the archives to all registered users. This is regardless of whether or not they have purchased a subscription at any time.
The previous Simple Search function is still available for performing a quick search but the Advanced Search allows a search to be performed by title (of Newspaper), a specific date, a range of dates (for instance, from 01/06/1919 to 28/02/1920) or any combination of these options.
If used correctly it should be possible to see the thumbnails of the pages you are looking for before making a decision to purchase a subscription.