I decided to take time away from my whippets and pigeons and go to London for a day. My head is now spinning after searching. 
Here is my plan.
2 adults and 2 kids under 11 travelling sat 16th April.
Plan is to start at Richmond (zone 4) and then do some sights in London (zone 1) then return to Richmond.
If I have this right, I buy two adult travelcards for zone 1-4 off peak at £7:30 each and this is all I need for unlimited travel for us all that day?
A quick yes or no or any pointers will be greatly appreciated with thanks and smilies given out as a thank you.
My heads a shed. Took me for ever to come up with this answer, which seems so simple but after the scouring so many sites it also seems too simple to be true.

Here is my plan.
2 adults and 2 kids under 11 travelling sat 16th April.
Plan is to start at Richmond (zone 4) and then do some sights in London (zone 1) then return to Richmond.
If I have this right, I buy two adult travelcards for zone 1-4 off peak at £7:30 each and this is all I need for unlimited travel for us all that day?
A quick yes or no or any pointers will be greatly appreciated with thanks and smilies given out as a thank you.
My heads a shed. Took me for ever to come up with this answer, which seems so simple but after the scouring so many sites it also seems too simple to be true.