If you have an Off-Peak Day Return (CDR) for a particular route, and want a change of route excess in order to return by a different route for which there is no CDR and for which the cheapest walk-up fare is a Super Off-Peak (SSR), can you do that as a simple change of route excess as described in section 4.2.1 at http://www.railforums.co.uk/showthread.php?t=70374, or does the fact that you're changing ticket type as well cause complications? (I see from section 4.2.4. that a change to a less restrictive ticket type involves payment of the full difference even if you only require the change in one direction).
If you can do it as a simple change of route, paying half the difference, are booking clerks or guards likely to know this?
The change of ticket type is purely due to the lack of a CDR on the more expensive route, not anything to do with time or break of journey restrictions -- neither the CDR nor the SSR have any relevant evening restrictions, and all travel in both directions will still be on one day.
If you can do it as a simple change of route, paying half the difference, are booking clerks or guards likely to know this?
The change of ticket type is purely due to the lack of a CDR on the more expensive route, not anything to do with time or break of journey restrictions -- neither the CDR nor the SSR have any relevant evening restrictions, and all travel in both directions will still be on one day.