(I've checked a copy of the ATOC fares manual, Farnborough North and Farnborough Main are considered to be the same destination)
I agree that tickets from Guildford to either Farnborough North or Farnborough Main are issued to Farnborough Stations.
I had no idea that a zero-fare excess existed. Does that mean that if I want to excess my annual season ticket (Guildford-Farnborough North, route "any permitted") to travel Guildford to Farnborough Main via Woking (same price) I have to ask for one of these?
No, that wouldn't work. Guildford - Farnborough Stations has two sets of fares:
Route Any Permitted and
Route Woking. The prices are
not the same.
National Fares Manual NFM 10 CD
Guildford - Farnborough Stations annual season tickets
Route Any Permitted
First Class £1476.00
Standard £984.00
Route Woking
First Class £2688.00
Standard £1580.00
Permitted Routes Guildford - Farnborough Stations are shown on
map MW only. That map shows a single red line joining Guildford with Farnborough Group, meaning that travel is permitted by any route which does not pass through any other Routeing Point, and does not double back (pass through a station more than once). In practice, this allows travel via Ash only. Guildford - Farnborough via Woking is not a Permitted Route.
But there are fares for Guildford - Farnborough via Woking, so my view is that NRCoC 13(e) allows the holder of a Guildford - Farnborough Stations Route Any Permitted ticket to travel via Woking on payment of the appropriate excess fare.