My father would always try and save our tickets, most ticket collectors being amenable to this despite it being their job to collect the used tickets as you left the platform.
A total surprise to me was that after my father's death in 1987, I discovered a dedicated album he had made with all my surviving special tour tickets in.
The entire Clemens ticket collection (plus two other ticket collections - A.J. Maund & D.C. Boyd) can be seen by clicking on the links below:
2 - C.N. 'Jim' Clemens - Special Tours Ticket Album - 85 Tickets.
5 - Alan Maund - Ticket Collection - including some rare examples - 27 Tickets .
Quite often my dad would purchase tickets purely because of their rarity value, especially if closure was imminent, and they would not be used for actual travel. For example, a substantial proportion of those on the Ashchurch to Upton on Severn branch fall into this category.
All the tickets have been scanned at high resolution and they are freely down-loadable, if you do make use of the archive in this way and use the material elsewhere please give the appropriate credit - thank you, Michael Clemens.