You've probably worked out your best route now but I cycle Harlesden - Farringdon and tried using the canal but you keep having to come off or stop for pedestrians or dodge crackheads under bridges, it's neither fast nor pleasurable. I find Harrow Rd/Marlyebone Rd/etc is the best way but it depends how much you enjoy riding in traffic, otherwise try going through Maida Vale and round Regents Park.
You've probably worked out your best route now but I cycle Harlesden - Farringdon and tried using the canal but you keep having to come off or stop for pedestrians or dodge crackheads under bridges, it's neither fast nor pleasurable. I find Harrow Rd/Marlyebone Rd/etc is the best way but it depends how much you enjoy riding in traffic, otherwise try going through Maida Vale and round Regents Park.