"Mizter T" wrote in message
...

This is very much do-able. Buy a zones 1-6 Day Travelcard at Balham,
then also buy a return extension ticket from the boundary of zone 6 to
Esher (though I suppose you could even buy a zones 1-4 Day Travelcard
and then an extension from boundary zone 4 to Esher).

The only possible problem might be coaxing the ticket office at Balham
to sell you the appropriate extension ticket. Then again perhaps I'm
just being a pessimist. Regardless the ticket office at Clapham Jn
would certainly sell you the right ticket without any problems.

I'll give it a go. Many thanks.

Ian