The Moorgate services aren't at 15 minute intervals. In the new timetable from WGC, it's xx58, xx09, xx28 and xx39. Every other one stopping at Brookmans Park and Welham Green.
But now off peak (between around 1000 and 1600) there's a xx09, xx26 and xx58. I don't know the new stopping patterns.
But now off peak (between around 1000 and 1600) there's a xx09, xx26 and xx58. I don't know the new stopping patterns.