My wife has a season ticket to travel from Merstham to Byfleet and New Haw. When She bought it, She was offered three different routes:
The first was 'Via Guildford' that seems pretty straightforward as Merstham to Redhill, Redhill to Guildford, and Guildford to Byfleet & New Haw.
The second was 'Via London'. The third was 'Not London'. Now this confused us, and the ticket office staff, as to what exactly 'London' is defined as.
She wants to travel via Clapham Junction, so is that defined as London or not? Assuming it is, then what other route is 'Not London'? Assuming it isn't, then why will her 'Not London' ticket not open the barriers at East Croydon or Clapham Junction?
Can anyone shed any light on where these routes actually go?
Yes, this situation is confusing myself as well and I am now going to further complicate matter unfortunately.
Within the FRPP (Online Fares Manual) the following flows are listed:
FRPP said:
MERSTHAM - BYFLEET & NEW H
(Derived from REDHILL - WOKING )
rte: NOT LONDON
Fare set by: SWT
7DS 59.90
7DF 101.80
rte: + Any Permitted
Fare set by: SWT
No Season Tickets listed
rte: GOMSHALL
Fare set by: GWR
7DS 53.20
7DF 79.80
rte: CLAPHAM JUNCTION
Fare set by: SWT
7DS 71.50
7DF 121.60
Key
7DS= Standard Seven Day Season
7DF= First Seven Day Season
SWT= South West Trains
GWR= First Great Western
Now the above brings in a new flow, the Route Clapham Junction flow. This flow is priced above the Not London flow and considering both the Not London and Clapham Junction flows are set by SWT it implies the Not London fare is invalid via Clapham Junction (i.e. it is not a separate TOC trying to undercut SWT that creates the anomaly).
The ultimate arbiter of permitted routes is the National Routeing Guide but this is not a simple route to look up (in fact its probably one of the most complicated I've encountered) with the origin station having two associated routeing points and the destination having four associated routeing points. Not only are there six potential routeing points but four separate flows to compare fares for depending on which ticket's validity you are analysing.
Merstham has Croydon and Redhill associated routeing points.
Redhill is an appropriate routeing points for all flows because Merstham fares are dervied from Redhill anyway.
Croydon is slightly more tricky because the same flows do not apply from Croydon, the only flows from Croydon are "rte NOT LONDON" (lower priced), "rte LONDON NOT UND" (nothing to compare) and "rte + Any Permitted" (lower priced). I think because of this, it best to use the Croydon Routeing Point for the rte NOT LONDON flow only (it will be the only flow able to use both Redhill and Croydon). Bear in mind the Any Permitted flow can be ignored as it has no season tickets listed for that routeing.
Byfleet and New Haw has Ascot (Berks), Staines, Surbiton and Woking associated routeing points.
Woking is an appropriate routeing point as it has identical fares from Merstham as those to Byfleet.
Surbiton has lower priced "rte NOT LONDON" and rte Any Permitted flows. Similar to the Croydon routeing point, I beleive only the NOT LONDON flow should be able to use Surbiton as a routeing point.
Staines has higher priced "rte NOT LONDON" and rte Any Permitted flows. Staines can therefore be eliminated completely.
Ascot (Berks) again has higher priced "rte NOT LONDON" and rte Any Permitted flows. Ascot (Berks) can also therefore be eliminated completely.
So the permitted routes using the appropriate maps combinations are as follows:
rte: NOT LONDON
Redhill Group to Woking: LONDON, CS+PD, LB+WX, SC+WX
Redhill Group to Surbiton: LONDON, CS+PD, SC+WX
Croydon Group to Woking: LONDON, SC+WX
Croydon Group to Surbiton: LONDON, SC+WX
LONDON: Eliminated
CS+PD: Redhill to Dorking to Guildford to Woking
CS+PD: Redhill to Dorking to Guildford to Surbiton (via Oxshott) to Woking
CS+PD: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
CS+PD: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Guildford (via Oxshott) to Woking
LB+WX: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
LB+WX: Redhill to Croydon to Crystal Palace to Tulse Hill to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
LB+WX: Redhill to Croydon to Crystal Palace to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Wimbledon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Mitcham Junction to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Epsom to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Epsom to Wimbledon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Crystal Palace to Tulse Hill to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Crystal Palace to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
rte: Any Permitted
No map combinations as Any Permitted flow is an irrelevance due to no season tickets being listed under the Any Permitted route.
rte: GOMSHALL
Redhill Group to Woking: LONDON, CS+PD, LB+WX, SC+WX
CS+PD: Redhill to Dorking to Guildford to Woking
CS+PD: Redhill to Dorking to Guildford to Surbiton (via Oxshott) to Woking
rte: CLAPHAM JUNCTION
Redhill Group to Woking: LONDON, CS+PD, LB+WX, SC+WX
CS+PD: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
CS+PD: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Guildford (via Oxshott) to Woking
LB+WX: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
LB+WX: Redhill to Croydon to Crystal Palace to Tulse Hill to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
LB+WX: Redhill to Croydon to Crystal Palace to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Wimbledon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Mitcham Junction to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Sutton to Epsom to Wimbledon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Crystal Palace to Tulse Hill to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
SC+WX: Redhill to Croydon to Crystal Palace to Streatham to Clapham Junction to Wimbledon to Surbiton to Woking
So to answer the OPs original question, yes you can use a rte NOT LONDON ticket via Clapham Junction. Do not be tempted by the name of the rte CLAPHAM JUNCTION fare. This ticket is a rip-off because it has less validity for a higher price, avoid at all costs.
P.S. As you can see above the Redhill Group to Woking encompasses all the map combinations between the other routeing points anyway so a lot of the fares check above was elementary. However it did raise an interesting question, if I have a route specific ticket do I have to compare fares that have the same route specific nature or can I compare any two fares that have the same route?