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Red&white is Gran Recorrido (GR) https://en.wikipedia.org/wiki/GR_footpath
Yellow&white is Pequeño recorrido (PR) https://es.wikipedia.org/wiki/Pequeño_Recorrido (In Spanish)
You can get the passport in the Irun Albergue (Albergue opens on 19 March to end of September)
http://www.caminosnorte.org/preguntas.html#albergue
http://www.irun.org/cod/entidades/entidad.asp?Clave=4303
Other option is fly to Madrid and take bus to Burgos (Depends on the hour you can take the bus at the airport).
Depends on your speed you can start to walk there or take the bus for other town. I think it's one of the best starts for 19 days walking for end in Santiago.
For return to Canada or...
Other option is fly with Ryanair to Zaragoza from London. In Zaragoza station you can travel to Jaca by train (http://www.renfe.com/EN/viajeros/index.html) or bus (http://www.avanzabus.com/web/default.aspx?lang=en)
This site is run by Ivar at in Santiago de Compostela.
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