I stumbled upon this post and thought of an interesting edge case that I thought I'd share here: For a flow that I occasionally use (Alloa ALO - Edinburgh Park EDP) the Anytime Single SDS and Off Peak Day Return CDR fares happen to be the same at 6.15 with a railcard. When booking a split ticket from ALO to destinations via the East Coast mainline, sometimes trainsplit offers a split at EDP. However they offer the ALO-EDP CDR (instead of SDS) with an advance from EDP, with the return portion of the CDR left unused. While the prices of the CDR and SDS are identical, with delay repay it seems like the SDS is objectively better here - in the event of a delay the passenger obtains compensation based on the SDS price, instead of half of the CDR price, and if no delay happens the price paid is the same regardless. Appreciate any thoughts about this.