On 2015-01-20 20:17:08 +0000, Neil Williams said:

Yes, half the difference, though finding a member of staff that knows
that and how to do it can be very challenging indeed. In the second
case you can technically get a zero fare excess but in practice the
more expensive ticket should just be accepted via the cheaper route.

Note for general reference: this only works with tickets with
geographical routes, not TOC routes. TOC routed tickets cannot be
excessed to another TOC route or to a non-TOC route.

Neil
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Neil Williams
Put my first name before the @ to reply.