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Hi,
You will find the information here: <http://tube.tfl.gov.uk/content/tickets/fandtjan2003.pdf?expandOnly=menu1&sideMenu=menu1option4>.
Because it's over the weekend, your cheapest choice is a weekend travel card zone 1-6. It will cost £7.60
The daily is £10.70 peak hours and £5.10 off-peak... so no point!

You can buy it in all the ticket offices at train and tube stations.

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Hi Mary,
Yes indeed the ticket is called a daily travelcard. For fares, the best thing is to look directly on the Tube website where you will find the information. Prices depend of the zones you want to include. I suggest zones 1-2 if you stay in the center as it allows you to move nearly everywere.
Have a nice trip

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