All the northern line is back to usual 15 min timetable, with some peak services strengthened to 6 car as usual.
As for the Wirral, this will remain as the 30 min Covid timetable due to social distancing requirements of train crew at the Wirral depot, making it not possible to resume a 15 min service frequency.
All Wirral lines (apart from Ellesmere port line and one circuit on the West Kirby during daytime off peak) are formed of 6 cars during the day.
New Brighton and West Kirby (apart from one on West Kirby) revert to 3 car in the evening.
Thanks for the great summary. I hadn't appreciated that it was half and half with Northern back to pre Covid effectively.