To clarify:
What’s changed is the extension of contactless to 20 new stations. The new Project Oval stations only charge peak fares 06.30-09.30 for stations towards London.
The legacy stations that have had contactless for a while continue to charge peak fares 06.30-09.30 (all zones) AND 16.00-19.00 (except for journeys to zone 1). The result is that in the evening peak a journey to eg a zone 2 station is cheaper from farther away. So it’s cheaper to zone 2 from Luton than from Luton Airport Parkway despite Luton being farther a stop further from zone 2.
So to overcome this anomaly I am hoping thr DfT / TfL bring the legacy GTR stations into line with other parts of London where the London-bound evening peak is charged at off peak for both the old and new contactless stations.