Information seeking challenge

[lovingboth]

If you want to travel outside the area ('zone') of London covered by your travelcard, you need to buy a Ticket Extension before you set off.

Your challenge is to find out, solely from the Transport for London website proclaimed as the official definitive source of such information, how much they currently cost.

Let me know how long it took...

Comments

[nitoda]

I gave up after three minutes - the PDF files were refusing to behave and I couldn't read them, but I expected to find the answer somewhere in one of them.