In message , at
13:57:35 on Sat, 17 Mar 2018, Paul Corfield
remarked:
To get the full facts then read the Mayoral Decision.

https://www.london.gov.uk/decisions/...es-20-may-2018

It is absolutely clear that Daily / 7 Day and longer Travelcards valid in Zone 6 will be valid to Heathrow using TfL. Ditto for daily / weekly
caps covering travel to Zone 6.

What that doesn't explicitly reveal is how outboundary through fares
such as:

http://www.brfares.com/#faredetail?o...&ldn=1&tkt=SVR

and

http://www.brfares.com/#faredetail?o...st=ZHJ&tkt=SVR

will be affected (if at all).

Although one obvious conclusion be "not at all".

In other words the Elizabeth Line trip won't count as 'underground' for
such fares, even if they presumably would for outboundary Travelcards.

The results in an anomaly for day tickets where for £50.50 one will be
able to get a [valid on Lizzy Line] outboundary travelcard:

http://www.brfares.com/#faredetail?o...d=0035&tkt=ADT

But it would cost £84.90 to do the same trip on a SDR:

http://www.brfares.com/#faredetail?o...d=0035&tkt=ADT

--
Roland Perry