Hi Bryan,
That’s certainly a comprehensive submission. Well done.
I did actually realise after posting that West Hampstead involved a Jubilee train in addition to the Met, although the interchange at Wembley Park involves no more than crossing an island platform so it’s not onerous. All three interchanges (Kilburn/West Hampstead/Finchley Road) are treated identically which is why the JP will sometimes suggest cutting out the Jubilee by using Finchley Road.
My only hesitation would be mentioning the hokey-cokey. Whilst it does work in some cases, it can often have unintended consequences. In this particular case there are no fares defined for Kenton to Harrow-on-the-Hill so I’m not sure what would be charged for that leg. New Malden to Northwick Park defaults to via zone 1. If there is time it might be better just to amble slowly and let the OSI expire after 20 minutes. However, I don’t think that one thing in your otherwise excellent case will make a difference.
Please do update us when you hear back.