You can go anywhere on Zones 1 - 6 on that above map on London Underground, London Overground, Docklands Light Railway, London Tramlink, London Buses (anywhere, not just 1-6) and National Rail services (except Heathrow Express, and Heathrow Connect between Hayes & Harlington and Heathrow and Southeastern Highspeed).
So i can get there on the Travelcard ?? sorry for asking these basic questions as im planning it in detail as me and a friend are going to photograph Trains and Emergency vehicles (any suggestions greatfully recieved)
Lots of confusion in this thread so please note the following:
Child rate off-peak travelcard for zones 1-6 is £3.20.
Child rate off-peak travelcard for zones 1-9 is £4.30.
Zones 1-9 allow you access to the whole Underground including the Met north of Moor Park and the Chiltern line to Amersham and London Overground to Watford High Street.
Both 1-6 and 1-9 allow access to Heathrow, but ONLY on the Picadilly line. The National Rail line between Heathrow and Hayes & Harlington is excluded (which means Heathrow Express is barred completely). The Southeastern line between St Pancras and Stratford International is also excluded.
The instructions are that the guard/ticket office should key in the origin as London Paddington (PAD) or any other station within the London zones, such as Knockholt, and the destination as 0035. The ticket type is ODT.