On 16 Feb, 13:53, "Rob Hamadi" wrote:
On Feb 16, 4:59 am, asdf wrote:

A ticket from London Terminals is a ticket from KXTL (for northbound
journeys) or City Thameslink (for southbound journeys). If you want to
extend the journey to/from Farringdon, you have to buy a more
expensive ticket to permit the extra travel.

What about a ticket, eg KXTL-Gatwick-KXTL, getting off at Farringdon
on the return leg.

AFAIAA it'd be fine to use such a ticket to leave at Farringdon.