In article ,
Nestor Badudoy wrote:
Hi there,

Currently in possession of a Z12 travelcard and want to use Silverlink to go
from West Hampstead to Highbury & Islington.

Possible or do I need to fork out extra as the train flirts with Z3 at
Hampstead Heath?

It does more than 'flirt'; it positivly enters zone 3 at that station.
You will need to get a zone 123 travelcard to travel from West Hampstead &
Highbury & Islington. Or something.

Or take a bus as far as Gospel Oak; get a Thameslink service into Kings Cross
and get the Victoria Line out; or get the Jubilee and Victoria; or ...

--
You dont have to be illiterate to use the Internet, but it help's.