Hi guys, looking for some quick advice from the ticketing experts. I hold an anytime travelcard from Kings Langley including zones 1-6, valid today. Can I use this the Southern from Clapham Junction to Watford Junction to get back to Kings Langley? The only bit that is doubtful in my mind is the bit between Harrow and Wealdstone and Watford Junction, since I'll be leaving the Travelcard Zones once I'm beyond Harrow and I won't be on a London Midland service. My guy instinct is that it is valid but confirmation would be good . Many thanks in advance.