During the national strikes GTR asked annual travelcard/season ticket holders to claim through delay repay for a 120+ minute journey to get a refund for that day so maybe it's a bit more widespread these days
The TfW Delay Repay web site asks if you travelled or abandoned your journey.
If you say you abandoned it, it says:
"As you told us you abandoned your journey and did not travel, you must contact the original ticket retailer for a refund. (Please note this does not apply to holders of season tickets or Multiflex tickets, who can proceed with their delay repay claim as normal)."
I don't know how one proceeds with a delay repay claim as normal for an abandoned journey, given that it's not normal thing to make such a claim via Delay Repay.