There's at least two diagrams which switch over at the shoulder peaks, so when the remaining six enter service it's worth working them forwards on RTT to see if they do this.730203 - LNR - Euston to Harrow & Wealdstone
a bonus as it was planned for long distance work but switched to a Tring stopper during the day.
Thanks Peter; I'll remember to check that.There's at least two diagrams which switch over at the shoulder peaks, so when the remaining six enter service it's worth working them forwards on RTT to see if they do this.