"Graham Murray" wrote

Roland Perry writes:

As it would be unlikely he was promising to freeze the cost of
outboundary travelcards, those who buy inboundary ones are probably
mainly "Londoners".

Though if the cost of outboundary travelcards increases too much it
could become cheaper to get a 'London Terminals' and use Oyster within
London. More likely to happen if you stay within zones 1&2 or only
travel on busses and trams.

But since you can buy an inboundary TC from a outboundary station or start
using Oyster at any interchange station there will be many options.

--
Mike D