"Graham Harrison" wrote:

How do you work out what the supplement is to travel on HS1? I will have
a Maidenhead to all zones Travelcard with a senior discount and I though I
might use HS1 from St P to Stratford International (then the bus out) just
for the fun of it and only one way.

I don't think that either an inboundary Travelcard, or an outboundary
Travelcard that's from a station for which HS1 would not be a valid route
into London, has any validity on the Southeastern Highspeed services
whatsoever (and there isn't a supplement which confers magic powers on it to
make it valid).

So basically you'd need to buy a ticket (£5 single, £3.30 single w/Railcard
discount).

One can take a peek at Stratford International and partake in the unusual
shuttle bus ride through the building site that links it to Stratford
(Regional) station without riding on the Highspeed trains - just head to
Stratford Regional and then find the shuttle bus from there to Int'l
(departs from the end of platform 11 or whatever it is), look around the
concourse/foyer and visit the flashy loos though note that there are ticket
gates which'll prevent you from getting down to the platforms, before
getting the shuttle bus back to Stratford Regional. (There's some notional
restriction on access to the Int'l station being limited to SE Highspeed
ticket holders, but given that there's ticket machines and I think a ticket
office available at the Int'l station, I don't think this means much, and
no-one checks for a ticket getting on the shuttle bus either.)