I am having similar problems Divvy - and I am a bedtime crazy too so I'm finding it tough but I have had to relax it a bit lately for similar reasons to you and trish most nights is 7:30 (especially early in the week if the weekend has been big) with the occasional up to 8pm on weekends or if the youngest has had a sleep during the day (which only happens at the end of the week). The oldest copes with the 8pm ok but the youngest does not. I'm sort of now starting the bedtime routine at 7:30 rather than 7:15 so that they are getting in to bed that slightly bit later - is making a bit of difference.

Masterchef really mucked with our bedtimes cause they wanted to watch it and would hear the music as they were being shunted to bed